Let's make an object with two functions, each of them will take a number as a parameter. Let the first function square the passed number, and the second function cube. An implementation:
let math = {
square: function(num) {return num * num},
cube: function(num) {return num * num * num},
};
Let's use our functions:
let math = {
square: function(num) {return num * num},
cube: function(num) {return num * num * num},
};
console.log( math.square(2) ); // shows 4
console.log( math.cube(2) ); // shows 8
Make an object with three functions, each of them will take an array of numbers as a parameter. Make the first function return the sum of the array elements, the second function return the sum of squares, and the third return the sum of cubes.