javascript pushing element at the beginning of an array [duplicate]

javascript pushing element at the beginning of an array [duplicate]

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How can I add new array elements at the beginning of an array in Javascript?

12 answers

I have an array of objects and I’d like to push an element at the beginning of the of the array.
I have this:
var TheArray = TheObjects.Array;
TheArray.push(TheNewObject);

It’s adding TheNewObject at the end. Do I need to create a new array, add TheNewObject to it and then loop through TheArray and add each element the to the array?

Solutions/Answers:

Solution 1:

Use unshift, which modifies the existing array by adding the arguments to the beginning:

TheArray.unshift(TheNewObject);

Solution 2:

Use .unshift() to add to the beginning of an array.

TheArray.unshift(TheNewObject);

See MDN for doc on unshift() and here for doc on other array methods.

FYI, just like there’s .push() and .pop() for the end of the array, there’s .shift() and .unshift() for the beginning of the array.

Solution 3:

For an uglier version of unshift use splice:

TheArray.splice(0, 0, TheNewObject);

Solution 4:

Try something like:

var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.write(fruits.unshift("Kiwi") + "<br />");
document.write(fruits.unshift("Lemon","Pineapple") + "<br />");
document.write(fruits);