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I have a few I always use in my applications these days. Cloning things is something I find myself doing routinely in single page applications and comparing values. I could list way more, but I stopped at three, it was hard just choosing one.

Cloning an array:

function cloneArray(array) {
    return array.slice();
}

Cloning an object:

function cloneObject(obj) {
    return JSON.parse(JSON.stringify(obj));
}

Object comparison:

For comparing if two objects are the same. Loops through and checks if their properties match, their lengths and so on.

function objectIsEqual(a, b) {
    var aProps = Object.keys(a);
    var bProps = Object.keys(b);

    if (aProps.length !== bProps.length) {
        return false;
    }

    for (let i = 0; i < aProps.length; i++) {
        var propName = aProps[i];

        if (a[propName] !== b[propName]) {
            return false;
        }
    }

    return true;
}