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

title
Combine Two Arrays Using the concat Method

Combine Two Arrays Using the concat Method

• The concat method is used to join two or more arrays or strings.
• This method does not mutate the existing arrays, but returns a new array.

Solution

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);