Add to Both Ends

Fundamentals: Part 2easy

Course · Section 3: JavaScript Fundamentals – Part 2 · Lecture 41: Basic Array Operations (Methods)

Implement `addEnds(arr, first, last)` returning a new array with `first` prepended and `last` appended.

Input: addEnds([2,3], 1, 4)

Output: [1,2,3,4]

Input: addEnds([], 1, 2)

Output: [1,2]

+ 1 hidden test run on Submit.

Common pitfalls

Approach & explanation (try first)

Spreading the array between the two new values builds a new array without mutation.

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Run your code to see results.