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Copy pathinsert.js
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executable file
·63 lines (44 loc) · 1.13 KB
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// 7. Insert an Item into an Array at Specific Index
function insert(arr) {
arr.splice(0, 1, 4);
return arr;
}
console.log(insert([2, 4, 6, 8]));
function insertUsingConcat() {
let a = [10, 20, 30, 40, 50];
let i = 2;
let a1 = [99, 100, 101];
let a2 = a.slice(0, i).concat(a1, a.slice(i));
console.log(a2);
}
insertUsingConcat();
function insertUsingSpreadAndSlice() {
let a = [10, 20, 30, 40, 50];
const i = 2;
const a1 = [99, 100, 101];
a = [...a.slice(0, i), ...a1, ...a.slice(i)];
console.log(a);
}
insertUsingSpreadAndSlice();
function insertUsingArrayFrom() {
let a = [10, 20, 30, 40, 50];
let a1 = [99, 100, 101];
let index = 1;
let a2 = Array.from({ length: a.length + a1.length }, (_, i) =>
i < index ? a[i] : i < index + a1.length ? a1[i - index] : a[i - a1.length],
);
console.log(a2);
}
insertUsingArrayFrom();
function insertUsingReduce() {
const a = [1, 2, 3, 4, 5];
const index = 2;
const a1 = [99, 100, 101];
const a2 = a.reduce((acc, curr, i) => {
if (i === index) acc.push(...a1);
acc.push(curr);
return acc;
}, []);
console.log(a2);
}
insertUsingReduce();