Exercise - Control flow

by Ryan Morris

JavaScript

/**
 * Exercise:
 *
 * Get to know your control flow and iteration
 *
 * Work in the console, or use "console.log()" to output to the console from the script
 *
 * these browser based functions can be used
 *     alert("Message string"); // will alert a message to the user
 *     var val = prompt("Question string?"); // will prompt the user for a value and return the value
 *     confirm("Message string"); // will ask the user to confirm with an ok, or cancel, returning a boolean
 */

// 1)
// Ask the user for a number (using prompt())
// Tell the user if it is even or odd (using alert())
// (hint: prompt() will always return a string)

var x = prompt("Give me a number");
if (x % 2 === 0) {
 alert("Your number is even");
} else {
 alert("Your number is odd");
}

// 2)
// Ask the user how old they are (using prompt())
// If they are 70 or older, tell them they look great.
// If they are 18 or younger, tell them they should be in school.
// If they are between those ages, tell them to get a job.
var age = prompt("How old are you?");

if (age > 70) {
  alert("You look great");
} else if (age <= 18) {
  alert("You should be in school");
} else {
  alert("Get a job, please");
}

// 3) 
// We have an array of values
// Use a while() statement to go through each value of the array
// and add 1 to each number (but not strings)
// log the resulting array to the console

var myArray = [1,2,3,"Interlocutor", 4,5,6];

var i = 0;
while (i < myArray.length) {
  if (typeof myArray[i] === "number") {
    myArray[i]++;
  }
  //i++;
  i = i + 1;
}
console.log("My resulting array", myArray);


// 4)
// Make an array of people's names
// Use a for statement to go through each and combine
// them into a single string separated by commas
// Log the result to the console.
// ex result: "John, Sally, Nick"

var names = ['Tim', 'John', 'Sally'];
var fullName;
for (var i=0; i<names.length; i++) {
  if (fullName) {
    fullName += ", " + names[i];
  } else {
     fullName = names[i];
 ...