If I array_pop on a non-empty-array, the returned value is never null, and so I should be able to array_unshift that value back onto the array (i.e. array_unshift ...

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push() and pop(), these two methods append elements to an array and remove an element from the an array respectively. Both of these methods work at the end of the array, where the index is largest.

JavaScript’s arrays can hold heterogeneous types, change size on the fly, and readily insert or remove elements. Traditional methods like slice, splice, and push/pop do this by operating on the array ...

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