Why is it not performing as expected when removing all non-numeric elements from the array?

let arr = [1, "5", 3, 27, undefined, { name: 'Steven' }, 11];

for (let i = 0; i < arr.length; i++) {
    if (typeof arr[i] !== 'number') {
        arr.splice(i, 1);
    }
}
console.log(arr); // result: [1, 3, 27, {…}, 11]

When switching the position of the object and the last number in the array, the output changes.

let arr = [1, "5", 3, 27, undefined, 11, { name: 'Steven' }];

for (let i = 0; i < arr.length; i++) {
    if (typeof arr[i] !== 'number') {
        arr.splice(i, 1);
    }
}
console.log(arr); // result: [1, 3, 27, 11]

Could someone provide an explanation for this?

Answer №1

A best practice is to avoid changing the length of an array while iterating over it. It is recommended that you utilize the filter method for a safer approach.

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