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let my_array = [1,2,3,4]
let last_element = my_array.at(-1)
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var my_array = /* some array here */;
var last_element = my_array[my_array.length - 1];
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let arr = ['a', 'b', 'c']
arr.slice(-1)[0] // returns last element in an array
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var colors = ["red","blue","green"];
var green = colors[colors.length - 1];//get last