lodash Working with Lists and Arrays Use _.map to Transform a List
Example
_.map is useful for changing a list into a different list in a purely
declarative way. Rather than using imperative techniques like a while or
for loop in javascript, you can just specify how you want to manipulate an
element of a list and
Use _.map to make a new list transformed by the function you provide.
Let's say we want to square all the numbers in a list. First we'll create a list using the _.range function:
var a = _.range(10); // [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]
Now we'll create a list of squares by using _.map:
var b = _.map(a, function(e){ return e * e;} );
// b is now [ 0, 1, 4, 9, 16, 25, 36, 49, 64, 81 ]
