Javascript Map Arrow Function

The following is what this implementation looks like as an arrow function: Const roots = numbers.map((num) => math.sqrt(num)); // roots is now [1, 2, 3] // numbers is still [1, 4, 9] copy to clipboard.

We will on the chapter class inheritance. Simple iteration over array of objects. Const roots = numbers.map((num) => math.sqrt(num));

If you need to return an object from an arrow function you should wrap the object in parentheses to let javascript know not to expect a statement block.

Map() does not execute the function for empty elements. Array.map (function (currentvalue, index, arr), thisvalue) Const sum = (a, b) => { return a + b } arrow functions introduce concise body syntax, or implicit return. The rule in es6 is that { immediately following an arrow is always treated as the start of a block, never the start of an object.