Sort Array Method Javascript

• Method used to sort elements of an array in place.

• Mutates the array

• Sorts elements as strings in lexicographic order (UTF-16 encoding), not alphabetical order

• lexicographic = (alphabet + numbers + symbols) as strings

• (a, b) => a-b

• if $a-b<0$ ; a, b

• if $a-b>0$ ; b, a

• if $a-b==0||\text{NAN}$ ; order is not changed

• Sorting array of object with a string property

  • (a, b) => a.title.localeCompare(b.title)

• Returns the reference to the original array on which the sort method is called

let nums = [1, 2, 10, 5, 4, 3];

nums.sort();
console.log(nums); // [1, 10, 2, 3, 4, 5]

nums.sort((a, b) => a - b);
console.log(nums); // [1, 2, 3, 4, 5, 10]

let x = nums.sort((a, b) => b - a);
console.log(x); // [10, 5, 4, 3, 2, 1]

x[0] = 30;
console.log(x); // [30, 5, 4, 3, 2, 1]

Resources

• https://www.youtube.com/watch?v=RsFBsBep-hA

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