How to add the reverse number in the array. I wanna add the number in reverse in the array.
var totalBidders = 22;
var NoOfWinners = 3;
var arr = [];
let e = totalBidders-NoOfWinners;
for (let i = totalBidders; i > e; i--) {
console.log( "=>" , i);
arr.push(i);
console.log(arr[i]);
}
But I got this :
index.js:484 => 22
index.js:486 undefined
index.js:484 => 21
index.js:486 undefined
index.js:484 => 20
index.js:486 undefined
Just use Array.reverse
var totalBidders = 22;
var NoOfWinners = 3;
var arr = [];
let e = totalBidders - NoOfWinners;
for (let i = totalBidders; i > e; i--) {
arr.push(i);
}
arr.reverse();
console.log(arr);OR
Simply control the loop variables.
Sample Implementation
var totalBidders = 22;
var NoOfWinners = 3;
var arr = [];
let e = totalBidders - NoOfWinners;
for (let i = 1; i <= NoOfWinners; i++) {
arr.push(e + i);
}
console.log(arr);Another way, one-liner if you don't mind:
const totalBidders = 22;
const NoOfWinners = 3;
const arr = [...Array(NoOfWinners).keys()].map((e) => totalBidders - e);
console.log(arr);.as-console-wrapper{min-height: 100%!important; top: 0}console.log(arr[i])
Will try to access the index 22, 21 & 20 values from an array arr but these indexes does not exist as arr.push(i) is pushing the 22, 21 & 20 as values at 0, 1 & 2nd index into an array.
If you want to access the values, You can try this :
console.log(arr[arr.length-1])
Demo :
const totalBidders = 22;
const NoOfWinners = 3;
const arr = [];
const e = totalBidders-NoOfWinners;
for (let i = totalBidders; i > e; i--) {
console.log( "=>" , i);
arr.push(i);
console.log(arr[arr.length - 1]);
}
arr.reverse();