Essential Books

Sorting multidimensional array

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Given the following array 

var array = [
  ["key1", 10],
  ["key2", 3],
  ["key3", 40],
  ["key4", 20]
];

You can sort it sort it by number(second index) 

array.sort(function(a, b) {
  return a[1] - b[1];
})
array.sort((a,b) => a[1] - b[1]);

This will output 

[
  ["key2", 3],
  ["key1", 10],
  ["key4", 20],
  ["key3", 40]
]

Be aware that the sort method operates on the array in place. It changes the array. Most other array methods return a new array, leaving the original one intact. This is especially important to note if you use a functional programming style and expect functions to not have side-effects.

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Arrays:
* Syntax
* Remarks
* Converting Array-like Objects to Arrays
* Reducing values
* Mapping values
* Filtering Object Arrays
* Sorting Arrays
* Iteration
* Removing duplicate elements
* Destructuring an array
* Array comparison
* Reversing arrays
* Concatenating Arrays
* Shallow cloning an array
* Merge two array as key value pair
* Array spread rest
* Finding the minimum or maximum element
* Removing items from an array
* Filtering values
* Standard array initialization
* Removing all elements
* Searching an Array
* Convert a String to an Array
* Joining array elements in a string
* Removing / adding elements using splice
* The entries() method
* Remove value from array
* Logical connective of values
* Flattening Arrays
* Object keys and values to array
* Append / prepend items to array
* Checking if an object is an array
* Sorting multidimensional array
* Insert an item into an array at a specific index
* Test all array items for equality
* Copy part of an array with slice()
* Using map to reformat objects in an array
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