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javascript count the occurrences in array

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Igor Curic answered on January 16, 2020 Popularity 9/10 Helpfulness 3/10

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javascript count the occurrences in array

Comment

let strxx=[ 'B', '_', 'R', 'R', 'B', 'R' ];

let strxy=strxx.reduce((acu,item)=>
{
		acu[item]=(acu[item]||0)+1;
		return acu;
},{}); // if you wont objec {}, if you wont array []

console.log(strxy);//{ B: 2, _: 1, R: 3 }

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: count javascript

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Contributed on Dec 07 2022

Igor Curic

0 Answers Avg Quality 2/10

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javascript Count the occurrences of a value in an array

Comment

const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);

// Examples
countOccurrences([2, 1, 3, 3, 2, 3], 2);                // 2
countOccurrences(['a', 'b', 'a', 'c', 'a', 'b'], 'a');  // 3

Popularity 10/10 Helpfulness 9/10 Language javascript

Source: 1loc.dev

Tags: count coun

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Contributed on Jul 02 2020

Batman

0 Answers Avg Quality 2/10

get number of occurrences in array javascript

Comment

const arr = [5, 5, 5, 2, 2, 2, 2, 2, 9, 4];
const counts = {};

for (const num of arr) {
  counts[num] = (counts[num] ?? 0) + 1;
}

console.log(counts); // {2: 5, 4: 1, 5: 3, 9: 1}

Popularity 8/10 Helpfulness 5/10 Language javascript

Source: stackoverflow.com

Tags: get javascript javas

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Contributed on Feb 13 2023

Plain Pollan

0 Answers Avg Quality 2/10

How to Count Certain Elements in an Array in JavaScript

Comment

const array = [1, 2, 3, 5, 2, 5, 9, 8, 3, 5, 2, 5].reduce((count, value) =>
 (value == 5 ? count + 1 : count), 0)   // --> 4

Popularity 8/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: count elements e

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Contributed on Jan 26 2023

</ProgAli>

0 Answers Avg Quality 2/10

count occurence in array js

Comment

// The initial array we want to count occurences
var initial = [5, 5, 5, 2, 2, 2, 2, 2, 9, 4];  

// The count array asked for
var count = Array.from(new Set(initial)).map(val => initial.filter(v => v === val).length);  

// Outputs [ 3, 5, 1, 1 ]

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: count coun

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Contributed on Aug 28 2022

Selfish Skylark

0 Answers Avg Quality 2/10

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

Comment

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

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: count coun

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Contributed on Jan 16 2020

Creepy Cormorant

0 Answers Avg Quality 2/10

count occurence in array js

Comment

var set = Array.from(new Set(initial));  

//set = [5, 2, 9, 4]

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: stackoverflow.com

Tags: count coun

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Contributed on Aug 28 2022

Selfish Skylark

0 Answers Avg Quality 2/10

javascript count the occurrences in array

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count occurence in array js

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

count occurence in array js

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