Count the number of times a same value appears in a javascript array
You could use reduce to get there:
Working example
var a = [1,2,3,1,2,3,4];
var map = a.reduce(function(obj, b) {
obj[b] = ++obj[b] || 1;
return obj;
}, {});
Another option is:
count = myArray.filter(x => x == searchValue).length;
There might be different approaches for such purpose.
And your approach with for
loop is obviously not misplaced(except that it looks redundantly by amount of code).
Here is some additional approaches to get the occurrence of a certain value in array:
Using
Array.forEach
method:var arr = [2, 3, 1, 3, 4, 5, 3, 1]; function getOccurrence(array, value) { var count = 0; array.forEach((v) => (v === value && count++)); return count; } console.log(getOccurrence(arr, 1)); // 2 console.log(getOccurrence(arr, 3)); // 3
Using
Array.filter
method:function getOccurrence(array, value) { return array.filter((v) => (v === value)).length; } console.log(getOccurrence(arr, 1)); // 2 console.log(getOccurrence(arr, 3)); // 3