JSFiddle - React, Tailwind, and code Playground

by Md. Atiquzzaman Soikat

JavaScript

var array = ["String 1", "string 2", "STRING 1", "String 2", "String 3", "String 1"];
array = array.map(function(string){
	return string.toLowerCase();
})
function count_array(arr) {
            var a = [], b = [], prev;

            arr.sort();
            for ( var i = 0; i < arr.length; i++ ) {
                if ( arr[i] !== prev ) {
                    a.push(arr[i]);
                    b.push(1);
                } else {
                    b[b.length-1]++;
                }
                prev = arr[i];
            }

            return [a, b];
        }
console.log(count_array(array));