How to use a Arrow Function

Question

I'm just reading up on ES6 features that have been implemented in Node v4.0.0 and saw Arrows. The example from Arrow Functions is:

var a = [
    "Hydrogen",
    "Helium",
    "Lithium",
    "Beryllium"
];
var a2 = a.map(function(s){ return s.length });
var a3 = a.map( s => s.length );

My question is how can I include multiple lines of code inside of a.map( s => s.length ); rather than just returning the length as in this example.

There are plenty of examples and details in the link you provided, even for multiple lined function, I don't see what can be added here. What exactly are you looking for that you did not find in the doc? — Holt
– Holt, Commented Sep 11, 2015 at 13:34
It's right there in the page you linked to at the very top: // Basic syntax: (param1, param2, paramN) => { statements } (param1, param2, paramN) => expression // equivalent to: => { return expression; } — Felix Kling
– Felix Kling, Commented Sep 11, 2015 at 13:39

Sergey Rybalkin · Accepted Answer · 2015-09-11 13:33:19Z

8

Just wrap your multiple code lines in curly braces like this:

var a3 = a.map( s => {
    var temp = s.length;
    return temp;
});

answered Sep 11, 2015 at 13:33

Sergey Rybalkin

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2 Comments

Jamie Hutber Over a year ago

Thats easier than I could ever have dreamed. I am looking forward to it.

Bergi Over a year ago

…and don't forget that the return is no more implicit then, right.

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