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Commit 3a69741

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Implement steps solutions - one of them with recursion, write tests
1 parent 059923d commit 3a69741

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‎09_steps/index.js

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// --- Directions
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// Write a function that accepts a positive number N.
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// The function should console log a step shape
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// with N levels using the # character. Make sure the
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// step has spaces on the right hand side!
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// --- Examples
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// steps(2)
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// '# '
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// '##'
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// steps(3)
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// '# '
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// '## '
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// '###'
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// steps(4)
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// '# '
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// '## '
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// '### '
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// '####'
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// Solution 1
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// function steps(n) {
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// if(n === 1) {
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// console.log("#");
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// } else {
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// for(let s = 1; s <= n; s++) {
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// console.log('#'.repeat(s) + ' '.repeat(n - s))
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//
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// }
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// }
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// }
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// Solution 2
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// function steps(n) {
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// for(let row = 0; row < n; row++) {
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// let stair = "";
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//
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// for (let column = 0; column < n; column ++) {
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// if(column <= row) {
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// stair += '#';
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// } else {
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// stair += ' ';
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// }
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// }
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// console.log(stair);
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// }
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// }
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function steps(n, row = 0, stair= '') {
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if (n === row) {
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return;
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}
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if(n === stair.length) {
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console.log(stair);
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return steps(n, row + 1);
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} else {
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if(stair.length <= row) {
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stair += '#'
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} else {
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stair += ' '
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}
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return steps(n, row, stair);
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}
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}
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module.exports = steps;

‎09_steps/test.js

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const steps = require('./index');
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beforeEach(() => {
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jest.spyOn(console, 'log');
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});
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afterEach(() => {
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console.log.mockRestore();
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});
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test('steps is a function', () => {
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expect(typeof steps).toEqual('function');
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});
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test('steps called with n = 1', () => {
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steps(1);
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expect(console.log.mock.calls[0][0]).toEqual('#');
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expect(console.log.mock.calls.length).toEqual(1);
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});
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test('steps called with n = 2', () => {
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steps(2);
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expect(console.log.mock.calls[0][0]).toEqual('# ');
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expect(console.log.mock.calls[1][0]).toEqual('##');
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expect(console.log.mock.calls.length).toEqual(2);
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});
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test('steps called with n = 3', () => {
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steps(3);
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expect(console.log.mock.calls[0][0]).toEqual('# ');
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expect(console.log.mock.calls[1][0]).toEqual('## ');
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expect(console.log.mock.calls[2][0]).toEqual('###');
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expect(console.log.mock.calls.length).toEqual(3);
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});

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