7 examples of 'count duplicate elements in array javascript' in JavaScript

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64function duplicateArray(array) {
65 return array.clone ? array.clone() : new Array(array.length);
66}
30function duplicateArray(arr) {
31 var newArr = [];
32 for(var i=0, arrSize=arr.length; i
1function countDuplicateArgs() {
2 const memo = {};
3 let areDuplicates = false;
4 Object.values(arguments).forEach((n) => {
5 if (!(n in memo)) memo[n] = 1;
6 else areDuplicates = true;
7 });
8 return areDuplicates;
9}
70function getCountOfDuplicates(changes: Change[]): CountOfDuplicateChanges {
71 return ArrayUtils.countDuplicates(
72 changes,
73 change => [change.type, change.action, change.name]
74 ) as CountOfDuplicateChanges;
75}
1function count_same_elements(collection) {
2 return collection
3}
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}
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}

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