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let arr= Array(1000000).fill(0).map((x,i)=>'file'+i); // 1M items
let last = arr.pop();
let last = arr.splice(-1,1);
let last = arr.reverse()[0]
let last = arr[arr.length - 1];
let last = arr.slice(-1)[0] ;
let [last] = arr.slice(-1);
let last = arr.slice(-1).pop();
let last = [...arr].pop();
let last = arr.reduceRight(a => a);
let last = arr.find((e,i,a)=> a.length==i+1);
let last = $(arr).get(-1);
let last = _.last(arr);
let last = _.nth(arr, -1);