Commit 741da8d

author

programmiri

committed

Solve exercise Collatz Conjecture

1 parent ce6856a commit 741da8dCopy full SHA for 741da8d

File tree

+33

-5

lines changed

+33

-5

lines changed

Lines changed: 28 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,28 @@`
	`1`	`+function divideByTwo(num) {`
	`2`	`+ return num / 2;`
	`3`	`+}`
	`4`	`+`
	`5`	`+function multiplyByThreeAddOne(num) {`
	`6`	`+ return num * 3 + 1;`
	`7`	`+}`
	`8`	`+`
	`9`	`+function steps(number) {`
	`10`	`+ if (number <= 0) {`
	`11`	`+ throw new Error('Only positive numbers are allowed');`
	`12`	`+ }`
	`13`	`+`
	`14`	`+ let currNumber = number;`
	`15`	`+ let count = 0;`
	`16`	`+ while (currNumber !== 1) {`
	`17`	`+ if (currNumber % 2 === 0) {`
	`18`	`+ currNumber = divideByTwo(currNumber);`
	`19`	`+ } else {`
	`20`	`+ currNumber = multiplyByThreeAddOne(currNumber);`
	`21`	`+ }`
	`22`	`+`
	`23`	`+ count++;`
	`24`	`+ }`
	`25`	`+ return count;`
	`26`	`+}`
	`27`	`+`
	`28`	`+export { steps };`

Lines changed: 5 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -5,25 +5,25 @@ describe('steps()', () => {`
`5`	`5`	`expect(steps(1)).toEqual(0);`
`6`	`6`	`});`
`7`	`7`
`8`		`- xtest('divide if even', () => {`
	`8`	`+ test('divide if even', () => {`
`9`	`9`	`expect(steps(16)).toEqual(4);`
`10`	`10`	`});`
`11`	`11`
`12`		`- xtest('even and odd steps', () => {`
	`12`	`+ test('even and odd steps', () => {`
`13`	`13`	`expect(steps(12)).toEqual(9);`
`14`	`14`	`});`
`15`	`15`
`16`		`- xtest('Large number of even and odd steps', () => {`
	`16`	`+ test('Large number of even and odd steps', () => {`
`17`	`17`	`expect(steps(1000000)).toEqual(152);`
`18`	`18`	`});`
`19`	`19`
`20`		`- xtest('zero is an error', () => {`
	`20`	`+ test('zero is an error', () => {`
`21`	`21`	`expect(() => {`
`22`	`22`	`steps(0);`
`23`	`23`	`}).toThrow(new Error('Only positive numbers are allowed'));`
`24`	`24`	`});`
`25`	`25`
`26`		`- xtest('negative value is an error', () => {`
	`26`	`+ test('negative value is an error', () => {`
`27`	`27`	`expect(() => {`
`28`	`28`	`steps(-15);`
`29`	`29`	`}).toThrow(new Error('Only positive numbers are allowed'));`

Comments

(0)