How to remove all occurences of an element from an array in JavaScript

In this tutorial you will learn how you can remove all occurrences of an element from an array in JavaScript without using any extra space i.e; in O(1) space complexity.

To solve this we are going to use two pointers and iterate through the array to remove all occurrences of an element.

Solution

  var removeElement = function(nums, val) {
      if (!nums.length)
          return 0
      let j = 0;
      for (let i=0;i<nums.length;i++) {
          if (nums[i] !== val) {
              nums[j++] = nums[i]
          }
      }
      return j
  };

  removeElement([3,2,2,3], 3);
  // [2,2]

Related Solutions

• How to remove empty objects from an array in JavaScript

• How to merge two or more arrays in JavaScript

• How to check if an array is empty in JavaScript

• How to split a string into words in JavaScript