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Getting the last element from an array

Getting the last element in an array by doing math with its length can lead to off-by-one errors. Doing this with Array.prototype.pop() would remove the value from the array. We can write a function that leaves the value in the array and does the math with length for us.

const last = array => array[array.length - 1]

last(['Bibidi', 'Babidi', 'Boo'])  // ⇒ 'Boo'
last([59, 75, 78, 752, 789, 881])  // ⇒ 881