Take the lowest value and the highest value of an array with Javascript?

Question

How do I get the lowest value and the highest value of the array separately with Javascript and jQuery?

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];

The lowest value in this case is 444.9 and the highest 984.9.

Answer 1

The simplest way would be like this:

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];
var min = Math.min(...arr);
var max = Math.max(...arr);


console.log(min); // 444.9
console.log(max); // 984.9

---

The most "conventional" way would be to combine the .reduce() with the Math.max|Math.min.

I also added a .map(Number) because you have strings and it’s better to work with numbers (even if it worked without that).

The Math.max and the Math.min accept two (or more) arguments, and return the largest/minor. The .reduce() passes the previous value and the new, which fits perfectly.

To know the maximum using .reduce():

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];
var max = arr.map(Number).reduce(function(a, b) {
  return Math.max(a, b);
});

console.log(max); // 984.9

To know the least using .reduce():

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];
var min = arr.map(Number).reduce(function(a, b) {
  return Math.min(a, b);
});

console.log(min); // 444.9

Answer 2

I advise you to use the library Lodash. The lib is extremely small and has several other very useful features.

It would just be this code below:

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];
console.log(_.min(arr)); //444.9
console.log(_.max(arr)); //984.9

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 3

You have to convert strings into numbers before making comparisons:

var arr = ["885.9", "984.9", "444.9", "528.9", "528.9"];
var maior = Number.NEGATIVE_INFINITY,
    menor = Infinity;

arr.forEach(function(item){
  if (Number(item) > maior) maior = item;
  if (Number(item) < menor) menor = item;
});

console.log(maior, menor)

Answer 4

You can use the Math.Max() and the Math.Min() to pick up the values, as it is something relatively simple I’ll just point out the links and let you study =]
This one too