What's the name of the "=>" operator in linq (e.g .Select(x=>x.Prop1) )

Question

What's the name of the "=>" operator (e.g in C# linq .Select(x=>x.Prop1) )

It might not even be an operator.

Does it have a different name in different languages (C# vs JavaScript)

Tagging as operator / C# / javascript - Not sure where this fits in...

It's a "lambda operator" https://msdn.microsoft.com/en-nz/library/bb311046.aspx In JS it's an "arrow function operator" — zerkms, Sep 16 '16 at 21:20
And it's pronounced "goes into" e.g. "x goes into x dot prop1" — John Wu, Sep 16 '16 at 21:20
@JohnWu: I don't think I've ever heard of it as "goes into" - but "goes to" instead. (Or just "to", e.g. "x to x dot prop1". — Jon Skeet, Sep 16 '16 at 21:22
The things you learn on SO! [link](http://stackoverflow.com/questions/274022/how-do-i-pronounce-as-used-in-lambda-expressions-in-net) — John Wu, Sep 16 '16 at 21:23

score 6 · Accepted Answer · answered Sep 16 '16 at 21:22

6

In C# it's called a "lambda operator". In JS it's called an "arrow function operator".

References:

answered Sep 16 '16 at 21:22

zerkms

Yup, it's like the JavaScript guys didn't know the proper name of the operator. – IS4 Sep 17 '16 at 01:04
@IllidanS4 unless there is no single proper name for it. – zerkms Sep 17 '16 at 01:26

score 1 · Answer 2 · answered Sep 16 '16 at 21:22

1

The => shorthand declaration of a function in javascript.

Example usage would be:

addition:(x,y)=>{
   return x+y
}

answered Sep 16 '16 at 21:22

2

It's a bit more than shorthand, considering its effect on scope... – Heretic Monkey Sep 16 '16 at 21:24
@MikeMcCaughan definitely. I added that link to the mdn article so he can read more in detail. – Sep 16 '16 at 21:28
Is the lodash one where you do .map(x => x.id) also the same (a function declaration) or do they 'overload' it? – Matt Sep 16 '16 at 22:17

score 1 · Answer 3 · answered Sep 16 '16 at 21:36

1

It's sometimes called a "fat arrow" (or "big boned arrow") but most often called a "lambda"

answered Sep 16 '16 at 21:36

Eonasdan

`=>` is called a "fat arrow" in PHP but not in C#. Nevertheless, I found that .NET people also understand that name since it's kind of a descriptive term. – wp78de Aug 29 '22 at 18:29

3 Answers3