JavaScript .unshift()

Adds one or more elements to beginning of array and returns new length.

Syntax

array.unshift(item1, item2, ...);

Examples

To add the element 'Monday' to the daysOfWeek array:

const daysOfWeek = [
  'Tuesday',
  'Wednesday',
  'Thursday',
  'Friday',
  'Saturday',
  'Sunday',
];

daysOfWeek.unshift('Monday');

console.log(daysOfWeek);
// Output: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']

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To add elements 1 and 2 to the countToTen array:

const countToTen = [3, 4, 5, 6, 7, 8, 9, 10];

countToTen.unshift(1, 2);

console.log(countToTen);
// Output: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

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Codebyte Example

The code below adds Lemon and Pineapple to the beginning of the array fruits with the help of the .unshift() method.

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