7 examples of 'how to prevent duplicate in array push in angular 2' in JavaScript

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30function duplicateArray(arr) {
31 var newArr = [];
32 for(var i=0, arrSize=arr.length; i<arrSize; i++) {
33 newArr.push(arr[i]);
34 }
35 return newArr;
36}
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64function duplicateArray(array) {
65 return array.clone ? array.clone() : new Array(array.length);
66}
52function horribleDuplicates (array) {
53 for (var i = 0; i < array.length; i++) {
54 for (var j = 0; j < array.length; j++) {
55 if (array[i] == array[j]) {
56 return true
57 }
58 }
59 }
60 return false
61}
434function patchPush (scope, obj, def, key) {
435 var meta = obj[metaKey][key]
436 var branch = def[key]
437 var isMarkerLast = branch[isMarkerLastKey]
438
439 return function push () {
440 var i = this.length
441 var j = i + arguments.length
442 var marker, currentNode
443
444 // Passing arguments to apply is fine.
445 var value = Array.prototype.push.apply(this, arguments)
446
447 for (j = i + arguments.length; i < j; i++) {
448 currentNode = replaceNode(scope, obj, def, key, this[i], null, i)
449 marker = meta.currentMarker
450 if (currentNode)
451 if (isMarkerLast) {
452 marker.parentNode.appendChild(currentNode)
453 marker.parentNode.appendChild(marker)
454 }
455 else marker.parentNode.insertBefore(currentNode, marker)
456 defineIndex(scope, obj, def, key, this, i)
457 }
458
459 return value
460 }
461}
1export function isContainsDuplicate2(arr: number[], k: number) {
2 const hash = {}
3 let i = 0
4
5 while (i < arr.length) {
6 if (i - hash[arr[i]] <= k) return true
7 hash[arr[i]] = i
8 i++
9 }
10
11 return false
12}
270export function getDuplicateNames(indexableArray: { name: string }[]): string[] {
271 const seen: { [name: string]: number } = {};
272 const duplicates: string[] = [];
273
274 indexableArray.forEach((element: { name: string }) => {
275 const { name } = element;
276 const count = seen[name] || 0;
277
278 if (count === 1) {
279 duplicates.push(name);
280 }
281 seen[name] = count + 1;
282 });
283 return duplicates;
284}
556function duplicateArrays(arr, times) {
557 const result = [];
558 for (let i = 0; i <= times; i++) {
559 result.push(...arr.map(a => a.slice(0)));
560 }
561 return result;
562}

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