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NM
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d
javascript
const array = [1,2,3,3,3,4,5,5];
let n = 0;
array.forEach((v,i,arr) => arr.indexOf(v) < i && ++n);
console.log(n);
3
d
IB
NM
IB
d
javascript
const array = [1,2,3,3,3,4,5,5];
let n = 0;
array.forEach((v,i,arr) => arr.indexOf(v) < i && ++n);
console.log(n);
3
arr.map((v, i) => ((arr.indexOf(v) < i && ++n), v));
ГЩ
ei
javascript
const array = [1,2,3,3,3,4,5,5];
let n = 0;
array.forEach((v,i,arr) => arr.indexOf(v) < i && ++n);
console.log(n);
3
ei
arr.map((v, i) => ((arr.indexOf(v) < i && ++n), v));
ei