JavaScript, Array · Oct 18, 2020
Counts the occurrences of a value in an array.
Array.prototype.reduce() to increment a counter each time the specific value is encountered inside the array.const countOccurrences = (arr, val) =>
arr.reduce((a, v) => (v === val ? a + 1 : a), 0);countOccurrences([1, 1, 2, 1, 2, 3], 1); // 3
Converts an array of objects to a comma-separated values (CSV) string that contains only the columns specified.
JavaScript, Array · Oct 13, 2021
Mutates the original array to filter out the values specified, based on a given iterator function.
JavaScript, Array · Oct 22, 2020
Filters an array of objects based on a condition while also filtering out unspecified keys.
JavaScript, Array · Oct 22, 2020