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js count number of times an element occurs in an array

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TP answered on January 16, 2020 Popularity 8/10 Helpfulness 8/10

answer js count number of times an element occurs in an array

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js count number of times an element occurs in an array

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const countItems = (arr, item) => {
    return arr.filter((x) => x === item).length;
 };
  
 // usage
 const myArr = [1, 8, 6, 7, 1, 8, 1];
 console.log(countItems(myArr, 1)); // returns 3

Popularity 8/10 Helpfulness 8/10 Language javascript

Source: Grepper

Tags: count element javascript

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Contributed on Feb 17 2023

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javascript check how many times value in array

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function f(array,value){
    var n = 0;
    for(i = 0; i < array.length; i++){
        if(array[i] == value){n++}
    }
    return n;
}

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: javascript j

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Contributed on Sep 18 2021

Tough Turkey

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count number of times an element is occuring in an array in javascript

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Array.prototype.frequencies = function() {
    var l = this.length, result = {all:[]};
    while (l--){
       result[this[l]] = result[this[l]] ? ++result[this[l]] : 1;
    }
    // all pairs (label, frequencies) to an array of arrays(2)
    for (var l in result){
       if (result.hasOwnProperty(l) && l !== 'all'){
          result.all.push([ l,result[l] ]);
       }
    }
    return result;
};

var freqs = [5, 5, 5, 2, 2, 2, 2, 2, 9, 4].frequencies();
alert(freqs[2]); //=> 5
// or
var freqs = '1,1,2,one,one,2,2,22,three,four,five,three,three,five'
             .split(',')
             .frequencies();
alert(freqs.three); //=> 3

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Source: stackoverflow.com

Tags: count coun

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Contributed on Jan 16 2020

Creepy Cormorant

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js count number of times an element occurs in an array

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