Unexpected token, expected “,” while looping through objects
I'm trying to map through collection of objects inside an object and access the color item, but i get an error Unexpected token, expected ","
. This is how i'm trying to map through. Is this the right way to map objects to retrieve value from colors.
{Object.keys(this.state.lists).map((item, i) =>
(this.state.lists[item].colors).map(item, i) =>
<li key={i}>{this.state.lists[item].colors[item]} </li>
)}
this.state.lists
looks like this:
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
javascript reactjs ecmascript-6
add a comment |
I'm trying to map through collection of objects inside an object and access the color item, but i get an error Unexpected token, expected ","
. This is how i'm trying to map through. Is this the right way to map objects to retrieve value from colors.
{Object.keys(this.state.lists).map((item, i) =>
(this.state.lists[item].colors).map(item, i) =>
<li key={i}>{this.state.lists[item].colors[item]} </li>
)}
this.state.lists
looks like this:
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
javascript reactjs ecmascript-6
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do{this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
What doestypeof this.state.lists
give you?
– inostia
Nov 26 '18 at 0:27
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39
add a comment |
I'm trying to map through collection of objects inside an object and access the color item, but i get an error Unexpected token, expected ","
. This is how i'm trying to map through. Is this the right way to map objects to retrieve value from colors.
{Object.keys(this.state.lists).map((item, i) =>
(this.state.lists[item].colors).map(item, i) =>
<li key={i}>{this.state.lists[item].colors[item]} </li>
)}
this.state.lists
looks like this:
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
javascript reactjs ecmascript-6
I'm trying to map through collection of objects inside an object and access the color item, but i get an error Unexpected token, expected ","
. This is how i'm trying to map through. Is this the right way to map objects to retrieve value from colors.
{Object.keys(this.state.lists).map((item, i) =>
(this.state.lists[item].colors).map(item, i) =>
<li key={i}>{this.state.lists[item].colors[item]} </li>
)}
this.state.lists
looks like this:
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
javascript reactjs ecmascript-6
javascript reactjs ecmascript-6
edited Nov 26 '18 at 18:11
inostia
3,08611624
3,08611624
asked Nov 26 '18 at 0:16
DekeDeke
1,39911223
1,39911223
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do{this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
What doestypeof this.state.lists
give you?
– inostia
Nov 26 '18 at 0:27
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39
add a comment |
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do{this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
What doestypeof this.state.lists
give you?
– inostia
Nov 26 '18 at 0:27
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do {this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do {this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
What does
typeof this.state.lists
give you?– inostia
Nov 26 '18 at 0:27
What does
typeof this.state.lists
give you?– inostia
Nov 26 '18 at 0:27
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39
add a comment |
2 Answers
2
active
oldest
votes
You are not passing a callback function to your second map
call, .map(item, i)
. Hence the syntax error. It should instead be something like .map((item, i) => ...)
.
Here's some cleaned up code that might make sense of this, though I haven't tested if it works with React:
const colors = Object.keys(this.state.lists).map(itemKey => {
return <li key={itemKey}>{this.state.lists[itemKey].colors[0]}</li>
})
And when you render,
<ul>{colors}</ul>
I wanted to output the result like this:{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
add a comment |
When using ES6 functions, you can omit the ()
of the parameters, only if you use 1 parameter. What you've done is actually closed your map
before you even got to the fat arrow (=>
). Your error is saying it doesn't understand the ,
in map(item, i)
, since map
doesn't accept a second parameter. Here's a bit of a break-down, followed by some optimized code for your problem.
A basic ES6 function is () => {}
, where the parameters go between the ()
braces, and the code goes between the {}
.
Here's a basic sum function: (a, b) => { return a+b }
. Since this only has one line, and it's the return value, you can omit the {}
brackets. i.e., (a, b) => a+b
Here's a hello function: (name) => { return 'hello ' + name }
. Since it only has 1 parameter, you can use name => { return 'hello ' + name }
. Or even using the above rule: name => 'hello ' + name
.
These shortcuts can make code easier to write, but perhaps more difficult to understand. If in doubt, just always keep the ()
braces to avoid confusion.
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
NOTES: Instead of using Object.keys
to get an array of keys, I just use a for...in
loop to accomplish the same thing.
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You are not passing a callback function to your second map
call, .map(item, i)
. Hence the syntax error. It should instead be something like .map((item, i) => ...)
.
Here's some cleaned up code that might make sense of this, though I haven't tested if it works with React:
const colors = Object.keys(this.state.lists).map(itemKey => {
return <li key={itemKey}>{this.state.lists[itemKey].colors[0]}</li>
})
And when you render,
<ul>{colors}</ul>
I wanted to output the result like this:{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
add a comment |
You are not passing a callback function to your second map
call, .map(item, i)
. Hence the syntax error. It should instead be something like .map((item, i) => ...)
.
Here's some cleaned up code that might make sense of this, though I haven't tested if it works with React:
const colors = Object.keys(this.state.lists).map(itemKey => {
return <li key={itemKey}>{this.state.lists[itemKey].colors[0]}</li>
})
And when you render,
<ul>{colors}</ul>
I wanted to output the result like this:{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
add a comment |
You are not passing a callback function to your second map
call, .map(item, i)
. Hence the syntax error. It should instead be something like .map((item, i) => ...)
.
Here's some cleaned up code that might make sense of this, though I haven't tested if it works with React:
const colors = Object.keys(this.state.lists).map(itemKey => {
return <li key={itemKey}>{this.state.lists[itemKey].colors[0]}</li>
})
And when you render,
<ul>{colors}</ul>
You are not passing a callback function to your second map
call, .map(item, i)
. Hence the syntax error. It should instead be something like .map((item, i) => ...)
.
Here's some cleaned up code that might make sense of this, though I haven't tested if it works with React:
const colors = Object.keys(this.state.lists).map(itemKey => {
return <li key={itemKey}>{this.state.lists[itemKey].colors[0]}</li>
})
And when you render,
<ul>{colors}</ul>
edited Nov 26 '18 at 1:54
answered Nov 26 '18 at 0:51
inostiainostia
3,08611624
3,08611624
I wanted to output the result like this:{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
add a comment |
I wanted to output the result like this:{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
I wanted to output the result like this:
{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
I wanted to output the result like this:
{Object.keys(this.state.lists).map((item, i) => <li key={i}>{this.state.lists[item].colors[0]}</li> )}
– Deke
Nov 26 '18 at 1:19
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
Oh... you just want the first color. Ok see my updated answer
– inostia
Nov 26 '18 at 1:22
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:
{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
I was turning the returned items to objects. so I decided to just loop over the array instead . finally went with this:
{this.state.lists.map(detail => {this.state.lists.map((det, i)=> <li>{detail.colors[i]}</li> )}
– Deke
Nov 26 '18 at 17:59
add a comment |
When using ES6 functions, you can omit the ()
of the parameters, only if you use 1 parameter. What you've done is actually closed your map
before you even got to the fat arrow (=>
). Your error is saying it doesn't understand the ,
in map(item, i)
, since map
doesn't accept a second parameter. Here's a bit of a break-down, followed by some optimized code for your problem.
A basic ES6 function is () => {}
, where the parameters go between the ()
braces, and the code goes between the {}
.
Here's a basic sum function: (a, b) => { return a+b }
. Since this only has one line, and it's the return value, you can omit the {}
brackets. i.e., (a, b) => a+b
Here's a hello function: (name) => { return 'hello ' + name }
. Since it only has 1 parameter, you can use name => { return 'hello ' + name }
. Or even using the above rule: name => 'hello ' + name
.
These shortcuts can make code easier to write, but perhaps more difficult to understand. If in doubt, just always keep the ()
braces to avoid confusion.
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
NOTES: Instead of using Object.keys
to get an array of keys, I just use a for...in
loop to accomplish the same thing.
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
add a comment |
When using ES6 functions, you can omit the ()
of the parameters, only if you use 1 parameter. What you've done is actually closed your map
before you even got to the fat arrow (=>
). Your error is saying it doesn't understand the ,
in map(item, i)
, since map
doesn't accept a second parameter. Here's a bit of a break-down, followed by some optimized code for your problem.
A basic ES6 function is () => {}
, where the parameters go between the ()
braces, and the code goes between the {}
.
Here's a basic sum function: (a, b) => { return a+b }
. Since this only has one line, and it's the return value, you can omit the {}
brackets. i.e., (a, b) => a+b
Here's a hello function: (name) => { return 'hello ' + name }
. Since it only has 1 parameter, you can use name => { return 'hello ' + name }
. Or even using the above rule: name => 'hello ' + name
.
These shortcuts can make code easier to write, but perhaps more difficult to understand. If in doubt, just always keep the ()
braces to avoid confusion.
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
NOTES: Instead of using Object.keys
to get an array of keys, I just use a for...in
loop to accomplish the same thing.
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
add a comment |
When using ES6 functions, you can omit the ()
of the parameters, only if you use 1 parameter. What you've done is actually closed your map
before you even got to the fat arrow (=>
). Your error is saying it doesn't understand the ,
in map(item, i)
, since map
doesn't accept a second parameter. Here's a bit of a break-down, followed by some optimized code for your problem.
A basic ES6 function is () => {}
, where the parameters go between the ()
braces, and the code goes between the {}
.
Here's a basic sum function: (a, b) => { return a+b }
. Since this only has one line, and it's the return value, you can omit the {}
brackets. i.e., (a, b) => a+b
Here's a hello function: (name) => { return 'hello ' + name }
. Since it only has 1 parameter, you can use name => { return 'hello ' + name }
. Or even using the above rule: name => 'hello ' + name
.
These shortcuts can make code easier to write, but perhaps more difficult to understand. If in doubt, just always keep the ()
braces to avoid confusion.
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
NOTES: Instead of using Object.keys
to get an array of keys, I just use a for...in
loop to accomplish the same thing.
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
When using ES6 functions, you can omit the ()
of the parameters, only if you use 1 parameter. What you've done is actually closed your map
before you even got to the fat arrow (=>
). Your error is saying it doesn't understand the ,
in map(item, i)
, since map
doesn't accept a second parameter. Here's a bit of a break-down, followed by some optimized code for your problem.
A basic ES6 function is () => {}
, where the parameters go between the ()
braces, and the code goes between the {}
.
Here's a basic sum function: (a, b) => { return a+b }
. Since this only has one line, and it's the return value, you can omit the {}
brackets. i.e., (a, b) => a+b
Here's a hello function: (name) => { return 'hello ' + name }
. Since it only has 1 parameter, you can use name => { return 'hello ' + name }
. Or even using the above rule: name => 'hello ' + name
.
These shortcuts can make code easier to write, but perhaps more difficult to understand. If in doubt, just always keep the ()
braces to avoid confusion.
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
NOTES: Instead of using Object.keys
to get an array of keys, I just use a for...in
loop to accomplish the same thing.
Documentation
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
const obj = {
1: {id: 1, colors:["red", "blue"]},
2: {id: 2, colors:["green", "yellow"]}
}
for (key in obj) {
const item = obj[key];
item.colors.map((color, i) => {
console.log( `<li key=${item.id}-${i}>${color}</li>`)
// Below lines are commented out because StackOverflow
// does not process JSX tags. Just uncomment and remove
// the console.log above
// return (
// <li key={item.id}-${i}>{color}</li>
// )
});
}
edited Nov 26 '18 at 4:35
answered Nov 26 '18 at 1:21
AnonymousSBAnonymousSB
2,229221
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{{id: 1, colors:["red", "blue"]}, {id: 2, colors:["green", "yellow"]}}
is not a valid object in Javascript. Are you sure it's not supposed to be an array? If it is an array you can just do{this.state.lists.map(item => ({item.colors.map(color => (<li key={i}>{color}</li>)})}
– inostia
Nov 26 '18 at 0:22
but i'm able to map through till here: `{Object.keys(this.state.lists).map((item, i) => <li> {this.state.lists[item].colors} </li> )}
– Deke
Nov 26 '18 at 0:26
What does
typeof this.state.lists
give you?– inostia
Nov 26 '18 at 0:27
type of gives me object. Sorry. my object is in this format: {1: {id: 1, colors:["red", "blue"]}, 2: {id: 2, colors:["green", "yellow"]}}
– Deke
Nov 26 '18 at 0:39