Commit e65af79

author

munnasorder

committed

add find, filter, findIndex method

1 parent 952d271 commit e65af79Copy full SHA for e65af79

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+73

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Lines changed: 25 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,25 @@`
	`1`	`+const myArray = [1,2,3,4,5,6,7,8,9];`
	`2`	`+`
	`3`	`+// example 1`
	`4`	`+Array.prototype.myFind = function(cb) {`
	`5`	`+ let result = [];`
	`6`	`+ for (let i = 0, length = this.length; i < length; i++) {`
	`7`	`+ if (cb(this[i], i, this)) result.push(this[i]);`
	`8`	`+ };`
	`9`	`+ return result;`
	`10`	`+}`
	`11`	`+const result = myArray.filter((doc, i, arr) => doc > 3);`
	`12`	`+console.log(result)`
	`13`	`+// output [ 4, 5, 6, 7, 8, 9 ]`
	`14`	`+`
	`15`	`+// example 2`
	`16`	`+function myOwnFilter(arr, cb) {`
	`17`	`+ let result = [];`
	`18`	`+ for (let i = 0, length = arr.length; i < length; i++) {`
	`19`	`+ if (cb(arr[i], i, arr)) result.push(arr[i]);`
	`20`	`+ }`
	`21`	`+ return result;`
	`22`	`+}`
	`23`	`+const result2 = myOwnFilter(myArray, (doc, i, arr) => doc > 5);`
	`24`	`+console.log(result2)`
	`25`	`+// output [ 6, 7, 8, 9 ]`

Lines changed: 24 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,24 @@`
	`1`	`+const myArray = [1,2,3,4,5,6,7,8,9];`
	`2`	`+`
	`3`	`+// example 1`
	`4`	`+Array.prototype.myFind = function(cb) {`
	`5`	`+ for (let i = 0, length = this.length; i < length; i++) {`
	`6`	`+ if (cb(this[i], i, this)) return this[i];`
	`7`	`+ };`
	`8`	`+};`
	`9`	`+`
	`10`	`+const result = myArray.myFind((doc, i, arr) => doc > 9);`
	`11`	`+console.log(result);`
	`12`	`+// output undefined`
	`13`	`+`
	`14`	`+`
	`15`	`+// example 2`
	`16`	`+function myOwnMap(arr, cb) {`
	`17`	`+ for (let i = 0, length = arr.length; i < length; i++) {`
	`18`	`+ if (cb(arr[i], i, arr)) return arr[i];`
	`19`	`+ }`
	`20`	`+}`
	`21`	`+`
	`22`	`+const result2 = myOwnMap(myArray, (doc, i, arr) => doc > 2);`
	`23`	`+console.log(result2);`
	`24`	`+// output 3`

Lines changed: 24 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,24 @@`
	`1`	`+const myArray = [1,2,3,4,5,6,7,8,9];`
	`2`	`+`
	`3`	`+// example 1`
	`4`	`+Array.prototype.myFindIndex = function(cb) {`
	`5`	`+ for (let i = 0, length = this.length; i < length; i++) {`
	`6`	`+ if (cb(this[i], i, this)) return i;`
	`7`	`+ }`
	`8`	`+ return -1;`
	`9`	`+}`
	`10`	`+const result = myArray.myFindIndex((doc, i, arr) => doc === 5);`
	`11`	`+console.log(result)`
	`12`	`+// output 4`
	`13`	`+`
	`14`	`+// example 2`
	`15`	`+function myOwnFindIndex(arr, cb) {`
	`16`	`+ for (let i = 0; i < arr.length; i++) {`
	`17`	`+ if (cb(arr[i], i, arr[i])) return i;`
	`18`	`+ }`
	`19`	`+ return -1;`
	`20`	`+}`
	`21`	`+`
	`22`	`+const result2 = myOwnFindIndex(myArray, (doc, i, arr) => doc === 8);`
	`23`	`+console.log(result2);`
	`24`	`+// output 7`

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