diff --git a/04week/loops.js b/04week/loops.js
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+'use strict'
+
+
+// for loop
+// Use a for loop to console.log each item in the array carsInReverse.
+
+
+// const carsInReverse = ['lebaron', 'concorde', 'wrangler'];
+
+
+// for (let i = 0; carsInReverse.length > i; i++) {
+//   console.log(carsInReverse[i]);
+// }
+
+
+// for...in loop
+// Create an object (an array with keys and values) called persons with the following data:
+// firstName: "Jane"
+// lastName: "Doe"
+// birthDate: "Jan 5, 1925"
+// gender: "female"
+
+
+// const persons = {
+//   firstName: "Jane",
+//   lastName: "Doe",
+//   birthDate: "Jan 5, 1925",
+//   gender: "female"
+// };
+
+
+// Use a for...in loop to console.log each key.
+
+
+// for (let x in persons) {
+//   console.log(x);
+// }
+
+// Then use a for...in loop and if state to console.log the value associated with the key birthDate.
+
+
+// for (let x in persons) {
+//   if (x === 'birthDate') {
+//     console.log(persons[x])
+//   }
+// }
+
+
+// while loop
+let x = 0;
+while (x < 1000) {
+  x++;
+  console.log(x)
+}
+
+// Use a for loop to console.log the numbers 1 to 1000.
+
+
+// for(let i = 1; i <= 1000; i++) {
+// console.log(i)
+// }
+
+// do...while loop
+// Use a do...while loop to console.log the numbers from 1 to 1000.
+
+
+// let i = 1;
+//
+// do {
+//   console.log(i), i++
+// }
+// while (i <= 1000)
+
+
+// When is a for loop better than a while loop?
+// when you want to check a condition AND the number of iterations is known and you want to initialize a variable and increase/decrease the variable.
+
+// How is the readability of the code affected?
+// while loops indicate checking condition/s. for loops check conditions while increasing or decreasing a variable.
+
+// What is the difference between a while loop and a do...while loop?
+// the while loop checks if the condition is true before executing the code block. the do..while loop executes the code block once before checking if the condition is true.