How to add an item at the beginning of an array in JavaScript
Published Aug 11 2020
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Say you want to add an item at the beginning of an array.
To perform this operation you will use the splice() method of an array.
splice() takes 3 or more arguments. The first is the start index: the place where we’ll start making the changes. The second is the delete count parameter. We’re adding to the array, so the delete count is 0 in all our examples. After this, you can add one or many items to add to the array.
To add at the first position, use 0 as the first argument:
const colors = ['yellow', 'red']
colors.splice(0, 0, 'blue')
//colors === ['blue', 'yellow', 'red']
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