Find largest number in multidimensional array

— My question concerns an array, not an object, which the similar question is for —

I have a multidimensional array, where I need to find the array with the largest number from a set position, then return the first item of that array.

I have this working, but feel there must be a better way to acheive this.

Here is my code, which is working in testing:

slidesArray = [["1",500],["2",750],["3",501]];

var EmpArr = []
var x = 0;
var len = slidesArray.length;
for (x; x < len; x++) {
    EmpArr.push(Math.max(slidesArray[x][1]))
}

var largestResult = Math.max(...EmpArr);

var result = slidesArray.filter(function(v,i) {
    return v[1] === largestResult;
}); 

In this example, I need to check slidesArray[0][1], slidesArray[1][1] and slidesArray[2][1] to find which is the largest number. Then I want to return the first element of the array which contains the largest, so here ‘2’.

>Solution :

1. You wrote a loop that can be replaced with the map function. This is basically what your wrote but in a longer fashion.

2. You use filter but you want to find 1 result so the function ‘find’ is more suitable.

const slidesArray = [["1",500],["2",750],["3",501]];

// Map an array with second entries only, then get the maximum value
let max = Math.max(...slidesArray.map(entry => entry[1]))

// Find entry with max value
let result = slidesArray.find(entry => entry[1] === max)

// Show result
console.log(result[0])