Exercise – Operators & Control Structures

by Colin Cheevers

JavaScript

/**
 * Exercise:
 *
 * Get to know your control structures
 *
 * 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 val = prompt("Please provide a number : ");

if(val % 2 == 0)
{
	alert("Value is Even");
}
else
{
	alert("Value 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("You should get a job!!");
}

// 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)
{
    console.log("Array element : " + myArray[i]);
    if(typeof myArray[i] == 'number')
    {
        console.log("number here");
    	myArray[i] +=1;
    }  
    console.log("Array nunber element incremented : " + myArray[i]);
    i++;    
}

// 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 myNames = ["Colin","Mark","John"];
var concatName="";
for (var i =...