first duplicate javascript
function firstDuplicate(a) {
let data = [];
for (dup of a) {
if (data[dup]) {
return dup
} else {
data[dup] = dup
}
}
return -1
}first duplicate javascript
function firstDuplicate(a) {
let data = [];
for (dup of a) {
if (data[dup]) {
return dup
} else {
data[dup] = dup
}
}
return -1
}how to copy all elements in an array except for the first one in javascript
// how to copy all elements in an array except for the first one in javascript
const tail = arr => (arr.length > 1 ? arr.slice(1) : arr);
console.log(tail([1, 2, 3])); // [2, 3]
console.log(tail([1])); // [1]Copyright © 2021 Codeinu
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