How to know the highest value of an Array?

Question

I am making 1 calculator that adds values typed by the user and when the values of sums arrive in 1000 or exceed, the loop ends.

So far so good, the problem is to be able to identify the largest value typed by the user

Each time the loop rotates I put to put the current value of var = i in an array so that all values entered by the user are stored in it.

In the end all values will be inside the array, but how to find the largest one?

Answer 1

In JS this is very simple:

Math.max.apply(null, meuArray );

Example of use:

var meuArray= [0,12,13,2,1273,28,1];
var maior = Math.max.apply(null, meuArray );

document.getElementById( 'resultado' ).innerHTML = maior;

<div id="resultado"></div>

The apply works as if you have passed the values of array as function parameters max, and would amount to typing Math.max(0,12,13,2.... The first parameter equals the scope to be used in the function, and in this case, as is indifferent, we pass null, representing the global scope.

If your array has much more than one million items, which is usually not the case, you can use a solution with loop.

Alternative solution: the loop. (teaching example)

var maior = 0;
for (var i = 0; i < meuArray.length; i++) {
   if ( meuArray[i] > maior ) {
      maior = meuArray[i];
   }
}

Answer 2

When I need to know the largest number of an array then I do one .sort().

For example:

[4,3,6,9].sort(function(a, b){return b - a;})

returns [9, 6, 4, 3], then I just need to get the first element. That is to say:

var elMaximo = [4,3,6,9].sort(function(a, b){return b - a;})[0];

Answer 3

If there is already a cycle that occurs for the reception of the entered numbers, I believe that you could also solve the problem of determining the largest number by creating a variable that always stores the largest value of the typed numbers.

Example (assuming you’re using a do while):

    ...
    var maior = 0;
    do
    {
       if (numeroInserido > maior ) {
          maior = numeroInserido;
       }    
       // aqui podes vai o código responsável pela soma e restante validação do limite
       // máximo do valor 1000        
    }while (...)

In this solution it will not be necessary to store the values in a array to determine the largest number typed.

Note: I assumed that you save the numbers in an array so that you can later determine the largest of them.

Answer 4

To find the largest number among a set of variables you can use the Math max function:

var a = 10;
var b = 25;
var c = 20;
maior = Math.max(a,b,c); 
console.log(maior) //25

It accepts multiple arguments so you can use spread (...) to use with arrays

var numeros = [1,2,5,200,89,5,50];
var maior = Math.max(...numeros);
console.log(maior) //200

as the name says, it "spreads" the array turning it into several separate arguments