Recently I have come across with another way of writing a function expression, like this: setTimeout(() =>{/*code*/},1000); as opposed to: setTimeout(function(){/*code*/},1000);
What is the benefit of using () = > rather than function(){}
Can I use it all the time or only in the certain situations?
Thanks.
There are a few differences between arrow functions and anonymous function declarations:
- Arrow functions don’t have a prototype-property.
- Arrow functions cannot be constructed
- Arrow functions don’t bind a this-value, so you’ll get the this-instance of the parent scope
- Arrow functions don’t have access to the special
arguments-object
For your use case, it’s difficult to say whether it’ll make a difference because we can’t see the code, but my guess is it won’t make a difference.
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The major benefit is the shorter syntax:
var sequence = source.map(t => t.length).filter(s => s > 5);
is shorter and more readable than:
var sequence = source
.map(function (t) { return t.length; })
.filter(function (s) { return s > 5; });
An arrow function expression has a shorter syntax compared to function expressions and lexically binds the
thisvalue
Source: MDN
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