How to count the Number of Occurrences of Specified Element in the Array in JavaScript - Step by Step Examples

How to count the Number of Occurrences of Specified Element in the Array in JavaScript ?

Answer

To count the number of occurrences of a specified element in an array in JavaScript, you can use methods like reduce, filter, or loops to iterate through the array and count each occurrence.

✐ Examples

1 Count Occurrences of Element 30 in Integer Array using reduce

In this example,

We create an integer array named numbers with values 10, 20, 30, 40, 30, 50.
We use the reduce method to count the occurrences of element 30 in the array.
The reduce method applies a function against an accumulator and each element in the array to reduce it to a single value.
We return the total count of occurrences of element 30.

JavaScript Program

const numbers = [10, 20, 30, 40, 30, 50];
const count = numbers.reduce((acc, curr) => curr === 30 ? acc + 1 : acc, 0);
console.log(`Number of occurrences of element 30: ${count}`);

Output

Number of occurrences of element 30: 2

2 Count Occurrences of Element 'banana' in String Array using filter

In this example,

We create a string array named fruits with values 'apple', 'banana', 'cherry', 'banana'.
We use the filter method to filter the elements that match 'banana'.
We return the length of the filtered array, which gives us the count of occurrences of 'banana'.

JavaScript Program

const fruits = ['apple', 'banana', 'cherry', 'banana'];
const count = fruits.filter(fruit => fruit === 'banana').length;
console.log(`Number of occurrences of element 'banana': ${count}`);

Output

Number of occurrences of element 'banana': 2

Summary

In this tutorial, we learned How to count the Number of Occurrences of Specified Element in the Array in JavaScript language with well detailed examples.

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How to count the Number of Occurrences of Specified Element in the Array in JavaScript - Step by Step Examples

How to count the Number of Occurrences of Specified Element in the Array in JavaScript ?

Answer

✐ Examples

1 Count Occurrences of Element 30 in Integer Array using reduce

JavaScript Program

Output

2 Count Occurrences of Element 'banana' in String Array using filter

JavaScript Program

Output

Summary

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