8000 First commit of practice exercises · giegieg/javascript-exercises@aa0d69d · GitHub
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First commit of practice exercises
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‎.DS_Store

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‎caesar/.DS_Store

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‎caesar/README.md

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‎caesar/caesar.js

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Lines changed: 15 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,19 @@
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const caesar = function() {
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const capitals = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
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3+
const caesar = function(str, shift) {
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let number = capitals.indexOf(str);
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return capitals[number+shift] ;
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}
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9+
// const caesar = function(str, shift) {
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// let result = "";
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// for(let i=0; i<str.length; i++) {
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// let letterNum = str.charCodeAt(i);
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// letterNum += shift;
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// result = result + String.fromCharCode(letterNum);
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// }
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// return result;
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// }
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module.exports = caesar

‎caesar/caesar.spec.js

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‎calculator/README.md

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‎calculator/calculator.js

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Lines changed: 24 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -1,25 +1,37 @@
1-
function add () {
2-
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function add (x,y) {
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return x+ y;
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}
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5-
function subtract () {
6-
5+
function subtract (x,y) {
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return x-y;
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}
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9-
function sum () {
10-
9+
function sum (arr) {
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total=0;
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for (let elem of arr) {
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total += elem;
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}
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return total;
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}
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13-
function multiply () {
14-
17+
function multiply (arr) {
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product = 1;
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for (let elem of arr) {
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product *= elem;
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}
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return product;
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}
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17-
function power() {
18-
25+
function power(x,y) {
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return(Math.pow(x,y));
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}
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21-
function factorial() {
22-
29+
function factorial(a) {
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answer = 1;
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for (i=a; i>0; i--) {
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answer *= i;
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}
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return answer;
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}
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module.exports = {

‎calculator/calculator.spec.js

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Original file line numberDiff line numberDiff line change
@@ -5,73 +5,73 @@ describe('add', function() {
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expect(calculator.add(0,0)).toEqual(0);
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});
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8-
xit('adds 2 and 2', function() {
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it('adds 2 and 2', function() {
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expect(calculator.add(2,2)).toEqual(4);
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});
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12-
xit('adds positive numbers', function() {
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it('adds positive numbers', function() {
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expect(calculator.add(2,6)).toEqual(8);
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});
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});
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1717
describe('subtract', function() {
18-
xit('subtracts numbers', function() {
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it('subtracts numbers', function() {
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expect(calculator.subtract(10,4)).toEqual(6);
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});
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});
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2323
describe('sum', function() {
24-
xit('computes the sum of an empty array', function() {
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it('computes the sum of an empty array', function() {
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expect(calculator.sum([])).toEqual(0);
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});
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28-
xit('computes the sum of an array of one number', function() {
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it('computes the sum of an array of one number', function() {
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expect(calculator.sum([7])).toEqual(7);
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});
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32-
xit('computes the sum of an array of two numbers', function() {
32+
it('computes the sum of an array of two numbers', function() {
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expect(calculator.sum([7,11])).toEqual(18);
3434
});
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36-
xit('computes the sum of an array of many numbers', function() {
36+
it('computes the sum of an array of many numbers', function() {
3737
expect(calculator.sum([1,3,5,7,9])).toEqual(25);
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});
3939
});
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4141
describe('multiply', function() {
42-
xit('multiplies two numbers', function() {
42+
it('multiplies two numbers', function() {
4343
expect(calculator.multiply([2,4])).toEqual(8);
4444
});
4545

46-
xit('multiplies several numbers', function() {
46+
it('multiplies several numbers', function() {
4747
expect(calculator.multiply([2,4,6,8,10,12,14])).toEqual(645120);
4848
});
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});
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5151
describe('power', function() {
52-
xit('raises one number to the power of another number', function() {
52+
it('raises one number to the power of another number', function() {
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expect(calculator.power(4,3)).toEqual(64); // 4 to third power is 64
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});
5555
});
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5757
describe('factorial', function() {
58-
xit('computes the factorial of 0', function() {
58+
it('computes the factorial of 0', function() {
5959
expect(calculator.factorial(0)).toEqual(1); // 0! = 1
6060
});
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62-
xit('computes the factorial of 1', function() {
62+
it('computes the factorial of 1', function() {
6363
expect(calculator.factorial(1)).toEqual(1);
6464
});
6565

66-
xit('computes the factorial of 2', function() {
66+
it('computes the factorial of 2', function() {
6767
expect(calculator.factorial(2)).toEqual(2);
6868
});
6969

70-
xit('computes the factorial of 5', function() {
70+
it('computes the factorial of 5', function() {
7171
expect(calculator.factorial(5)).toEqual(120);
7272
});
7373

74-
xit('computes the factorial of 10', function() {
74+
it('computes the factorial of 10', function() {
7575
expect(calculator.factorial(10)).toEqual(3628800);
7676
});
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});

‎fibonacci/README.md

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‎fibonacci/fibonacci.js

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Lines changed: 25 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,28 @@
1-
const fibonacci = function() {
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// const fibonacci = function(x) {
2+
// if(x<0) {
3+
// return("OOPS");
4+
// }
5+
// let sequence = [1,1];
6+
// for(let i=2; i<x; i++) {
7+
// var currentNum = sequence[i-2] + sequence[i-1];
8+
// sequence.push(currentNum);
9+
// }
10+
// return currentNum;
11+
// }
212

3-
}
413

14+
const fibonacci = function(x) {
15+
if(x<0) {
16+
return("OOPS");
17+
}
18+
let currentNum = 0;
19+
let prevMem = 1;
20+
let prevPrevMem = 1;
21+
for (let i=2; i<x; i++) {
22+
currentNum=prevMem+prevPrevMem;
23+
prevPrevMem = prevMem;
24+
prevMem = currentNum;
25+
}
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return currentNum;
27+
}
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module.exports = fibonacci

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