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in javascript what is =>

Posted on 2015-02-23
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Last Modified: 2015-04-25
In javascript what does this mean => when using in context.

For example

 const run = {
    "←": ([x, y]) => [x - 1, y],
    "→": ([x, y]) => [x + 1, y],
    "↓": ([x, y]) => [x, y - 1],
    "↑": ([x, y]) => [x, y + 1] 
  };

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Question by:stargateatlantis
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Expert Comment

by:Rainer Jeschor
ID: 40625776
Hi,
as far as I know this is not "pure" Javascript as this operator "=>" is not specified.

But Typescript has such constructs to manage expectations and to provide some kind of type safe programming functionality.
Please have a look here in the specs:
http://www.typescriptlang.org/Content/TypeScript%20Language%20Specification.pdf

HTH
Rainer
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Accepted Solution

by:
stargateatlantis earned 0 total points
ID: 40734500
This is ES6 functions
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Author Closing Comment

by:stargateatlantis
ID: 40743796
The question wasn't answered.  The arrow functions are part of javascript ECMA 6
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