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Objective
Write the function `extend` which takes an array and an additional element and returns an array with the additional element at the end of the array.
For example,
`extend([1,2,3], 4) => [1,2,3,4]`
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Extend
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function extend(array, el) {
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2 points
Write the function extend which takes an array and an additional element and returns an array with the additional element at the end of the array.
For example,
extend([1,2,3], 4) => [1,2,3,4]
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JavaScript (function)