Javascript Question posted in
A very good W3school tutorial can be found here.

First Item kills next item up to array length is equal 1 in JavaScript

let arr = [1, 2, 3, 4, 5];

for (let i = 0; i <= arr.length - 1; i++) {
  let ar = arr.splice(i, 1);
  console.log(ar.flat())
}

I have an array. 1 kills 2, 3 kills 4 like and array is [1,3,5]. 5 kills 1, 3 kills 5, and so on. Final operation is 3. How to do in JavaScript?

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2

Answers


  1. 0

    The below code seems to work, we just need to reset the index when its crosses the array limit and a while loop will run until we only have one element in the array, then the logic seems to work!

    let arr = [1, 2, 3, 4, 5];

/*
for(let i=0;i<=arr.length-1;i++){
let ar = arr.splice(i,1);
console.log(ar.flat())
}
*/
let index = 0;
while (arr.length > 1) {
  index = index < arr.length - 1 ? index + 1 : 0;
  arr.splice(index, 1);
}

console.log(arr);
    .as-console-wrapper {
  top: 0;
  max-height: 100% !important;
}
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  2. 0 
    let arr = [1, 2, 3, 4, 5];
while (arr.length > 1)
  arr = arr.filter(() => this.del ? --this.del : this.del = +1, { del: 1 })
console.log(arr)
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