find duplicates in array
function findDuplicates(arr) {
const duplicates = new Set()
return arr.filter(item => {
if (duplicates.has(item)) {
return true
}
duplicates.add(item)
return false
})
}find duplicates in array
function findDuplicates(arr) {
const duplicates = new Set()
return arr.filter(item => {
if (duplicates.has(item)) {
return true
}
duplicates.add(item)
return false
})
}how to count duplicates in an array javascript
arr.reduce((b,c)=>((b[b.findIndex(d=>d.el===c)]||b[b.push({el:c,count:0})-1]).count++,b),[]);Copyright © 2021 Codeinu
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