JAVASCRIPT

for each

const array1 = ['a', 'b', 'c'];

array1.forEach(element => console.log(element));

// expected output: "a"
// expected output: "b"
// expected output: "c"

each function

function each(coll, func) { 
       if (Array.isArray(coll)) { 
             for (var i = 0; i < coll.length; i++) { 
                   func(coll[i], i); 
             } 
       } else { 
             for (var key in coll) { 
                   func(coll[key], key); 
             } 
       } 
 }