JAVASCRIPT

array iteration

let arr = ['js', 'python', 'c++', 'dart']

// no 1
for (item of arr) {
	console.log(item);
}

// no 2
for (var item = 0; item < arr.length; item++) {
	console.log(arr[i]);
}

// no 3
arr.forEach(item=>{
	console.log(item);
})

// no 4
arr.map(item=>{
	console.log(item);
})

// no 5
var item = 0;
while (item < arr.length) {
	console.log(arr[item]);
  	item++;
}

iterate array

    for (let value of array) {
      sum+=value;
    }

iterate array

for (let [key,val] of array.entries()) {
  console.log([key,val]);
}