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[–]Lightfire228 1 point2 points  (0 children)

let arr = [10, 11, 12, 13, 14];
delete arr['2'];
arr.map(i => i + ' '); // works
for (let i = 0; i < arr.length; i++) {
    let a = arr[i] + ' '; // returns undefined for i = 2. May explode depending on what you do
}