JavaScript Array Operations: Map

/** * Map creates a new array populated with the results of calling a provided * function on every element in the calling array. * * @param {any} element - The current element. * @param {number} index (Optional) - The index of the current element. * @param {Array} array (Optional) - The array map was called upon. */ function transform (element, index, array) { /* return transformed element */ return "Number " + element.toString(); } [0, 1, 2, 3, 4, 5].map(transform);

// Let's start with an array const numbers = [0, 1, 2, 3, 4, 5];

// Let's operate over all the numbers with a map const doubles = numbers.map(number => number * 2);

// Let's perform a more complex operation const powers = doubles.map(number => Math.pow(number, 2));