items from first array that are not in the second array javascript
let difference = arrA.filter(x => !arrB.includes(x));
items from first array that are not in the second array javascript
let difference = arrA.filter(x => !arrB.includes(x));
first duplicate javascript
function firstDuplicate(a) {
let data = [];
for (dup of a) {
if (data[dup]) {
return dup
} else {
data[dup] = dup
}
}
return -1
}
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