Remap: a way of doing filter and map at the same time.

remap.ts

// remap gets the array you want to process and the callback function, passing to it the same properties as a map.
// The data returned by the callbackFn will be filtered out if undefined, or mapped in if something else.
// Everything at the cost of only one loop pass.
function remap<T, R>(array: T[], callbackFn: (value: T, index: number, array: T[]) => R | undefined): R[] {
    const result = new Array<R>();

    for (let i = 0; i < array.length; i++) {
        const data = callbackFn(array[i], i, array);

        if (data !== undefined) result.push(data);
    }

    return result;
}