How to sort an array in javascript?

JavaScript: How to sort an array in javascript?

It is very simple to sort in JS. Just use the .sort() method. But there are a few important things to know and be aware of:

Sorting a-z, just use .sort():

  1.         word_array = [
  2.  
  3.         "animal",
  4.         "phone",
  5.         "water",
  6.         "computer",
  7.         "bottle",
  8.  
  9.         ];
  10.  
  11.         console.log(word_array.sort()); // (5) ["animal", "bottle", "computer", "phone", "water"]

However, if you use .sort() on an array of numbers it will not sort it correctly:

  1.         num_array = [
  2.  
  3.             1000,
  4.             200,
  5.             22,
  6.             2,
  7.             102,
  8.             199,
  9.             150,
  10.             100000,
  11.             2.24,
  12.         ];
  13.  
  14.         console.log(num_array.sort()); //(9) [1000, 100000, 102, 150, 199, 2, 2.24, 200, 22]

The output from this - [1000, 100000, 102, 150, 199, 2, 2.24, 200, 22] is clearly not sorted propperly. It sorted it by comparing character by character, as if it was a string comparison.

You can fix this by providing a comparison function to sort, like this:

  1.         num_array = [
  2.  
  3.             1000,
  4.             200,
  5.             22,
  6.             2,
  7.             102,
  8.             199,
  9.             150,
  10.             100000,
  11.             2.24,
  12.         ];
  13.  
  14.         console.log(num_array.sort(function(a,b) { return a-b; }));

And this will now output the correctly sorted array: [2, 2.24, 22, 102, 150, 199, 200, 1000, 100000]

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webdevetc

I am a 29 year old backend web developer from London, mostly focusing on PHP and Laravel lately. This (webdevetc.com) is my blog where I write about some web development topics (PHP, Laravel, Javascript, and some server stuff). contact me here.



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