Make immutable pop(), push(), shift(), unshift()?

We know very well how these functions work in Javascript. So, here I am going to write immutable implementations for the same functions as per my understanding. Please do comment your suggestions/concerns/questions. I will always happy to update this a…


This content originally appeared on DEV Community and was authored by DEV Community

We know very well how these functions work in Javascript. So, here I am going to write immutable implementations for the same functions as per my understanding. Please do comment your suggestions/concerns/questions. I will always happy to update this article.

function pop(arr) {
    let newArr = [...arr];
    newArr.length = arr.length - 1;
    return newArr;
}

function push(arr, ...item) {
    const newArr = [...arr];
    if (item.length >= 1) {
        for (let i = 0; i < item.length; i++) {
            newArr[newArr.length] = item[i];
        }
    }
    return newArr;
}

function shift(arr) {
    [a, ...b] = arr;
    return b;
}

function unshift(arr, ...item) {
    const newArr = [];
    if (item.length >= 1) {
        for (let i = 0; i < item.length; i++) {
            newArr[i] = item[i];
        }
    }
    newArr.push(...arr);
    return newArr;
}

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This content originally appeared on DEV Community and was authored by DEV Community


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