node js http create server method, may some one explain me about the method works?
can some one explain me what is ?: and why at the end the server there are :
javascript node.js typescript
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
add a comment |
can some one explain me what is ?: and why at the end the server there are :
javascript node.js typescript
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
1
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47
add a comment |
can some one explain me what is ?: and why at the end the server there are :
javascript node.js typescript
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
can some one explain me what is ?: and why at the end the server there are :
javascript node.js typescript
javascript node.js typescript
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
edited Nov 24 '18 at 7:02
Nedko Dimitrov
508615
508615
asked Nov 24 '18 at 6:35
wakandawakanda
12
asked Nov 24 '18 at 6:35
wakandawakanda
12
asked Nov 24 '18 at 6:35
wakandawakanda
12
12
1
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47
add a comment |
1
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47
1
1
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47
add a comment |
1 Answer
1
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oldest
votes
Official documentation describes it very well so i leave it here.
In JavaScript, every parameter is optional, and users may leave them off as they see fit. When they do, their value is undefined. We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional.
So in a short way for this case: the parameters for the requestListener are optional.
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
add a comment |
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1 Answer
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Official documentation describes it very well so i leave it here.
In JavaScript, every parameter is optional, and users may leave them off as they see fit. When they do, their value is undefined. We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional.
So in a short way for this case: the parameters for the requestListener are optional.
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
add a comment |
Official documentation describes it very well so i leave it here.
In JavaScript, every parameter is optional, and users may leave them off as they see fit. When they do, their value is undefined. We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional.
So in a short way for this case: the parameters for the requestListener are optional.
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
add a comment |
Official documentation describes it very well so i leave it here.
In JavaScript, every parameter is optional, and users may leave them off as they see fit. When they do, their value is undefined. We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional.
So in a short way for this case: the parameters for the requestListener are optional.
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
Official documentation describes it very well so i leave it here.
In JavaScript, every parameter is optional, and users may leave them off as they see fit. When they do, their value is undefined. We can get this functionality in TypeScript by adding a ? to the end of parameters we want to be optional.
So in a short way for this case: the parameters for the requestListener are optional.
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
edited Dec 6 '18 at 10:00
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
answered Dec 6 '18 at 9:02
MassiveCodesMassiveCodes
185110
185110
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
add a comment |
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
1
1
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
This would be a better answer if you linked to the documentation you were quoting.
– Quentin
Dec 6 '18 at 9:04
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
Edited my post.
– MassiveCodes
Dec 6 '18 at 9:10
add a comment |
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1
Don't post images of code. Provide a proper code snippet and ask your question
– Nagaraju
Nov 24 '18 at 6:46
That looks like TypeScript
– Tico
Nov 24 '18 at 6:46
@Tico yes it is typescript
– Nedko Dimitrov
Nov 24 '18 at 6:47