freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/functional-programming/combine-two-arrays-using-the-concat-method/index.md

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Combine Two Arrays Using the concat Method

Combine Two Arrays Using the concat Method

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Hints

Hint 1

• The concat method is used to join two or more arrays or strings.

Hint 2

• This method does not mutate the existing arrays, but returns a new array.

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Solutions

Solution 1 (Click to Show/Hide)

function nonMutatingConcat(original, attach) {
  // Add your code below this line

  return original.concat(attach);

  // Add your code above this line
}
var first = [1, 2, 3];
var second = [4, 5];
nonMutatingConcat(first, second);