javascript Count the occurrences of a value in an array
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'); // 3count the number of elements in an array javascript
var arr = [10,20,30,40,50]; //An Array is defined with 5 instances
var len= arr.length; //Now arr.length returns 5.Basically, len=5.
console.log(len); //gives 5
console.log(arr.length); //also gives 5Copyright © 2021 Codeinu
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