54 lines
963 B
JavaScript
54 lines
963 B
JavaScript
const add = function(a, b) {
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return a + b;
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};
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const subtract = function(a, b) {
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return a - b;
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};
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const sum = function(array) {
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return array.reduce((total, current) => total + current, 0);
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};
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const multiply = function(array) {
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return array.length
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? array.reduce((accumulator, nextItem) => accumulator * nextItem)
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: 0;
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};
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const power = function(a, b) {
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return Math.pow(a, b);
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};
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//alternate solution using the Exponentiation operator
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const altPower = function(a, b) {
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return a ** b;
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};
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const factorial = function(n) {
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if (n === 0) return 1;
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let product = 1;
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for (let i = n; i > 0; i--) {
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product *= i;
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}
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return product;
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};
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// This is another implementation of Factorial that uses recursion
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// THANKS to @ThirtyThreeB!
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const recursiveFactorial = function(n) {
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if (n === 0) {
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return 1;
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}
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return n * recursiveFactorial (n-1);
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};
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module.exports = {
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add,
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subtract,
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sum,
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multiply,
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power,
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factorial
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};
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