Javascript：按每个内部数组中的第二个元素对数组排序

Question

I have an array that looks like this:

const arr = [
  [500, 'Foo'],
  [600, 'bar'],
  [700, 'Baz'],
];

I would like to sort this arr alphabetically by the second element in each inner array, ie:

[
  [600, 'bar'],
  [700, 'Baz'],
  [500, 'Foo'],
]

Note the case insensitivity. Also, I would love to use lodash helpers if they come in handy here!

Answer 1

Here is a concrete, working example, using Array.prototype.sort :

 const arr = [ [500, 'Foo'], [600, 'bar'], [700, 'Baz'] ]; arr.sort((a,b) => a[1].toUpperCase().localeCompare(b[1].toUpperCase())); console.log(arr); 

Answer 2

Array.prototype.sort takes a function which will be applied to each pair of items in the array. The return of that function determines how the items are sorted (it needs to return a positive number, 0, or a negative number).