arrayMystery3

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< arrayMystery2

arrayMystery4 >

Main Page → Exercises → JavaScript → Solve an Exercise

Language/Type: JavaScript arrays array mystery

What are the contents of the array arr after the following code executes?

let arr = [];
for (let i = 1; i <= 5; i++) {
    arr.push(2 * i);         // [2, 4, 6, 8, 10]
}
let size = arr.length;
for (let i = 0; i < size; i++) {
    arr.splice(i, 0, 42);   // add 42 at index i
}

`contents of arr`
`[2, 4, 6, 8, 10, 42, 42, 42, 42, 42]` `[42, 42, 42, 42, 42, 2, 4, 6, 8, 10]` `[42, 2, 42, 4, 42, 6, 42, 8, 42, 10]` `[2, 42, 4, 42, 6, 42, 8, 42, 10, 42]` `other`

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arrayMystery3