// The function constructor can take in multiple statements separated by a semicolon. Function expressions require a return statement with the function's name

​

// Observe that new Function is called. This is so we can call the function we created directly afterwards

const sumOfArray = new Function('const sumArray = (arr) => arr.reduce((previousValue, currentValue) => previousValue + currentValue); return sumArray')();

​

// call the function

sumOfArray([1, 2, 3, 4]);

// 10

​

// If you don't call new Function at the point of creation, you can use the Function.call() method to call it

const findLargestNumber = new Function('function findLargestNumber (arr) { return Math.max(...arr) }; return findLargestNumber');

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// call the function

findLargestNumber.call({}).call({}, [2, 4, 1, 8, 5]);

// 8

​

// Function declarations do not require a return statement

const sayHello = new Function('return function (name) { return `Hello, ${name}` }')();

​

// call the function

sayHello('world');

// Hello, world