for of example

Example 1: javascript for...of index

for (const [i, v] of ['a', 'b', 'c'].entries()) {
  console.log(i, v)
}

Example 2: for of and for in javascript

let arr = ['el1', 'el2', 'el3'];

arr.addedProp = 'arrProp';

// elKey are the property keys
for (let elKey in arr) {
  console.log(elKey);
}

// elValue are the property values
for (let elValue of arr) {
  console.log(elValue)
}

Example 3: mdn for..of

function* fibonacci() { // a generator function
  let [prev, curr] = [0, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

for (const n of fibonacci()) {
  console.log(n);
  // truncate the sequence at 1000
  if (n >= 1000) {
    break;
  }
}

Example 4: use these instead of a for loop javascript

const array = [1,2,3,4,5];const evenNumbers = array.filter(function(elem) {   // expressions that return 'true' are retained   return elem % 2 == 0;});