freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/functional-programming/add-elements-to-the-end-of-an-array-using-concat-instead-of-push/index.md

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Add Elements to the End of an Array Using concat Instead of push

Add Elements to the End of an Array Using concat Instead of push

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Problem Explanation

Where the push method adds new element to the end of the orginal array, the concat method creates a new array containing the elements from the original array and the new element. The original array remains the same when using concat.

Relevant Links

• Array.prototype.concat()

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Solutions

Solution 1 (Click to Show/Hide)

function nonMutatingPush(original, newItem) {
  // Add your code below this line

  return original.concat(newItem);

  // Add your code above this line
}

var first = [1, 2, 3];
var second = [4, 5];
nonMutatingPush(first, second);