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Combining Arrays Without Duplicates

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Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -17,4 +17,5 @@ Once inside, run the command below:`
`17`	`17`	`8. Search and Replace`
`18`	`18`	`9. Anagram`
`19`	`19`	`10. Pig-latin`
`20`		`-11. Chunk Array`
	`20`	`+11. Chunk Array`
	`21`	`+12. Combining Arrays Without Duplicates`

Lines changed: 12 additions & 0 deletions

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`@@ -0,0 +1,12 @@`
	`1`	`+// pick a solution and insert here to run the test.`
	`2`	`+`
	`3`	`+function mergeArrays(...arrays) {`
	`4`	`+ let jointArray = []`
	`5`	`+`
	`6`	`+ arrays.forEach(array => {`
	`7`	`+ jointArray = [...jointArray, ...array]`
	`8`	`+ });`
	`9`	`+ return Array.from(new Set([...jointArray]))`
	`10`	`+}`
	`11`	`+`
	`12`	`+module.exports = mergeArrays;`

Lines changed: 59 additions & 0 deletions

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`@@ -0,0 +1,59 @@`
	`1`	`+// USING A SET`
	`2`	`+function mergeArrays(...arrays) {`
	`3`	`+`
	`4`	`+ let jointArray = []`
	`5`	`+`
	`6`	`+ arrays.forEach(array => {`
	`7`	`+ jointArray = [...jointArray, ...array]`
	`8`	`+ });`
	`9`	`+`
	`10`	`+ return [...new Set([...jointArray])]`
	`11`	`+`
	`12`	`+}`
	`13`	`+`
	`14`	`+// USING ARRAY.FROM() WITH SET`
	`15`	`+`
	`16`	`+function mergeArrays(...arrays) {`
	`17`	`+ let jointArray = []`
	`18`	`+`
	`19`	`+ arrays.forEach(array => {`
	`20`	`+ jointArray = [...jointArray, ...array]`
	`21`	`+ });`
	`22`	`+ return Array.from(new Set([...jointArray]))`
	`23`	`+}`
	`24`	`+`
	`25`	`+// USING .FILTER()`
	`26`	`+`
	`27`	`+function mergeArrays(...arrays) {`
	`28`	`+`
	`29`	`+ let jointArray = []`
	`30`	`+`
	`31`	`+ arrays.forEach(array => {`
	`32`	`+ jointArray = [...jointArray, ...array]`
	`33`	`+ })`
	`34`	`+`
	`35`	`+ const uniqueArray = jointArray.filter((item,index) => jointArray.indexOf(item) === index)`
	`36`	`+`
	`37`	`+ return uniqueArray`
	`38`	`+}`
	`39`	`+`
	`40`	`+// USING .REDUCE()`
	`41`	`+`
	`42`	`+function mergeArrays(...arrays) {`
	`43`	`+`
	`44`	`+ let jointArray = []`
	`45`	`+`
	`46`	`+ arrays.forEach(array => {`
	`47`	`+ jointArray = [...jointArray, ...array]`
	`48`	`+ })`
	`49`	`+`
	`50`	`+ const uniqueArray = jointArray.reduce((newArray, item) =>{`
	`51`	`+ if (newArray.includes(item)){`
	`52`	`+ return newArray`
	`53`	`+ } else {`
	`54`	`+ return [...newArray, item]`
	`55`	`+ }`
	`56`	`+ }, [])`
	`57`	`+`
	`58`	`+ return uniqueArray`
	`59`	`+}`

Lines changed: 13 additions & 0 deletions

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`@@ -0,0 +1,13 @@`
	`1`	`+const mergeArrays = require('./index');`
	`2`	`+`
	`3`	`+test('mergeArrays is a function', () => {`
	`4`	`+ expect(typeof mergeArrays).toEqual('function');`
	`5`	`+});`
	`6`	`+`
	`7`	`+test('Combines 5 arrays of numbers without dubplicates', () => {`
	`8`	`+ expect(mergeArrays([1,2],[2,3],[3,4],[4,5])).toEqual([1,2,3,4,5]);`
	`9`	`+});`
	`10`	`+`
	`11`	`+test('Combines 3 arrays of strings without dubplicates', () => {`
	`12`	`+ expect(mergeArrays(['a','b','z'],['m','n','a'],['z','y'])).toEqual(['a','b', 'z', 'm', 'n', 'y']);`
	`13`	`+});`

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