How to count elements in the array in Javascript [duplicate]

Question

I want to make an Array of 100 elements from numbers[1,10] and then count how many of every number is in that Array. How can I do it? I have the Array with random numbers:

function random(min, max) {
   return Math.floor(Math.random() * (max - min + 1)) + min;
}

for(var y=0 ; y<100 ; y++)
{
   tab[y]=random(1, 10);
}

but I don't know how to search for every number.

sort array uisng var sorted_arr = yourarrayname.sort(); then count it will be easier — Arunprasanth K V
– Arunprasanth K V, Commented Mar 9, 2015 at 12:31
buddy, @heylala, check out link w3schools.com/jsref/tryit.asp?filename=tryjsref_length_array — Vikrant
– Vikrant, Commented Mar 9, 2015 at 12:31
buddy, @Victor, should probably read the whole question instead of just the title. — user1106925
– user1106925, Commented Mar 9, 2015 at 12:33

Arun P Johny · Accepted Answer · 2015-03-09 12:40:03Z

0

You can

function random(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

var tab = [];
for (var y = 0; y < 100; y++) {
    tab[y] = random(1, 10);
}

//counter the instances of each number
var counter = {};
for (var i = 0; i < tab.length; i++) {
    if (!counter[tab[i]]) {
        counter[tab[i]] = 0;
    }
    counter[tab[i]]++;
}

console.log(counter)

Demo: Fiddle

edited Mar 9, 2015 at 12:40

answered Mar 9, 2015 at 12:33

Arun P Johny

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