javascript compare duplicates in array
let strArray = [ "q", "w", "w", "w", "e", "i", "u", "r"];
let findDuplicates = arr => arr.filter((item, index) => arr.indexOf(item) != index)
console.log(findDuplicates(strArray)) // All duplicates
console.log([...new Set(findDuplicates(strArray))]) // Unique duplicateshow to get duplicate values from array in javascript
var array = [1, 2, 2, 3, 3, 4, 5, 6, 2, 3, 7, 8, 5, 22, 1, 2, 511, 12, 50, 22];
console.log([...new Set(
array.filter((value, index, self) => self.indexOf(value) !== index))]
);Find duplicate or repeat elements in js array
const a = [4,3,6,3,4,3]
function count_duplicate(a){
let counts = {}
for(let i =0; i < a.length; i++){
if (counts[a[i]]){
counts[a[i]] += 1
} else {
counts[a[i]] = 1
}
}
for (let prop in counts){
if (counts[prop] >= 2){
console.log(prop + " counted: " + counts[prop] + " times.")
}
}
console.log(counts)
}
count_duplicate(a)Find duplicate or repeat elements in js array
function findUniq(arr) {
return arr.find(n => arr.indexOf(n) === arr.lastIndexOf(n));
}
console.log(findUniq([ 0, 1, 0 ]))
console.log(findUniq([ 1, 1, 1, 2, 1, 1 ]))
console.log(findUniq([ 3, 10, 3, 3, 3 ]))
console.log(findUniq([ 7, 7, 7, 20, 7, 7, 7 ]))Find duplicate or repeat elements in js array
const a = [4,3,6,3,4,3]
function count_duplicate(a){
let counts = {}
for(let i =0; i < a.length; i++){
if (counts[a[i]]){
counts[a[i]] += 1
} else {
counts[a[i]] = 1
}
}
for (let prop in counts){
if (counts[prop] >= 2){
console.log(prop + " counted: " + counts[prop] + " times.")
}
}
console.log(counts)
}
count_duplicate(a)
/* 3 counted: 3 times.
4 counted: 2 times.
{ '3': 3, '4': 2, '6': 1 }
*/Find duplicate or repeat elements in js array
const a = [4,3,6,3,4,3]
function count_duplicate(a){
let counts = {}
for(let i =0; i < a.length; i++){
if (counts[a[i]]){
counts[a[i]] += 1
} else {
counts[a[i]] = 1
}
}
for (let prop in counts){
if (counts[prop] >= 2){
console.log(prop + " counted: " + counts[prop] + " times.")
}
}
console.log(counts)
}
count_duplicate(a)
/* 3 counted: 3 times.
4 counted: 2 times.
{ '3': 3, '4': 2, '6': 1 }
*/Copyright © 2021 Codeinu
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