javascript delete item from array code example

Example 1: remove a particular element from array

var colors = ["red","blue","car","green"];
var carIndex = colors.indexOf("car");//get  "car" index
//remove car from the colors array
colors.splice(carIndex, 1); // colors = ["red","blue","green"]

Example 2: javascript remove from array by index

//Remove specific value by index
array.splice(index, 1);

Example 3: how to take an element out of an array in javascript

var data = [1, 2, 3];

// remove a specific value
// splice(starting index, how many values to remove);
data = data.splice(1, 1);
// data = [1, 3];

// remove last element
data = data.pop();
// data = [1, 2];

Example 4: remove item from array javascript

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

Example 5: remove element from array javascript

// Remove single item
function removeItemOnce(arr, value) {
   var index = arr.indexOf(value);
   if (index > -1) {
      arr.splice(index, 1);
   }
   return arr;
}

// Remove all items
function removeItemAll(arr, value) {
   var i = 0;
   while (i < arr.length) {
      if (arr[i] === value) {
         arr.splice(i, 1);
      } else {
         ++i;
      }
   }
   return arr;
}

// Usage
console.log(removeItemOnce([2, 5, 9, 1, 5, 8, 5], 5));
console.log(removeItemAll([2, 5, 9, 1, 5, 8, 5], 5));

Example 6: how to remove element from array in javascript

/* there are 3 ways to do so
1) pop(), which removes the last element
2) shift(), which removes the first element
3) splice(), which removes any element with a specified index.
of these only splice() takes parameters. the first parameter it takes is the
index of the element to be removed, an integer. the second is the number of 
elements to be removed, again integer. the third and fourth etc. are optional,
which is to be used if you want to replace them. Example: */
let numbers = [1, 2, 3, 4, 5];
numbers.pop(); // removes 5
numbers.shift(); // removes 1
let threeIndex = numbers.indexOf(3); // used for long arrays
numbers.splice(threeIndex, 1); // without replacement
numbers.splice(threeIndex, 1, 7) // 3 will now be replaced by 7