In JavaScript how would I create a variable to go through an array and remember not only the highest value but also the position of that value

Question

var array = [1,2,3,4,5];
for(i = 0; i < array.length; i ++){

}

This is how far I have understood it (not my actual code just an example) and how would I use this for loop to go through the array and then not only remember the highest value but also the position that it is in. What I want to do specifically in my code is create a point system that increases the values of different position numbers in the array, then sorts through them to find the highest value and depending on which position/variable in the array has the highest value it will do something different. apologies for the grammar.

So in short, are you trying to get the highest value and the index as well? From the example its `index 4` and the value is `5` — Kopi Bryant, Mar 25 '21 at 02:12
https://stackoverflow.com/questions/11301438/return-index-of-greatest-value-in-an-array/11301464 — , Mar 25 '21 at 02:12

score 0 · Answer 1 · answered Mar 25 '21 at 02:13

You could write a function that keeps track of the index with the highest value, max, and update it whenever arr[i] is greater -

function goThroughAnArrayAndRememberNotOnlyTheHighestValueButAlsoThePositionOfThatValue(arr)
{ if (arr.length == 0) return false
  let max = 0
  for (let i = 1; i < arr.length; i++)
    if (arr[i] > arr[max])
      max = i
  return { highestValue: arr[max], positionOfThatValue: max }
}

const input1 =
  [ 1, 6, 4, 3, 9, 5, 8, 7 ]
  
const input2 =
  []

console.log(goThroughAnArrayAndRememberNotOnlyTheHighestValueButAlsoThePositionOfThatValue(input1))
// { highestValue: 9, positionOfThatValue: 4 }

console.log(goThroughAnArrayAndRememberNotOnlyTheHighestValueButAlsoThePositionOfThatValue(input2))
// false

Mister Jojo · Answer 2 · 2021-03-25T13:39:29.330

0

simply use an array.reduce method

var myArray = [0,1,2,12,3,4,5]
 
const f_MaxPos = arr => arr.reduce((r,c,i)=>
  {
  if (!i || c > r.max)
    {
    r.max = c 
    r.pos = i
    } 
  return r
  }, { max:undefined, pos:-1 })
 

console.log( JSON.stringify( f_MaxPos( myArray ) ) )

.as-console-wrapper {max-height: 100%!important;top:0}

edited Mar 25 '21 at 13:39

answered Mar 25 '21 at 02:53

Mister Jojo

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In JavaScript how would I create a variable to go through an array and remember not only the highest value but also the position of that value

2 Answers2