Exercise – Operators & Control Structures

by Andrew Corliss

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 value = prompt("Please send a number through?");
var inte = parseInt(value, 10);

if (inte % 2 === 0) {
	alert("This is even");	
} else {
	alert("This 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 ageOfUser = prompt("How old are you?");
var ageInt = parseInt(ageOfUser, 10);

if (ageInt >= 70) {
	alert("You look great");
} else if(ageInt <= 18) {
	alert("You should be in school");
} else {
	alert("Go 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 modifyArray = [];

var i = 0;

while (i < myArray.length) {
	
    if (!isNaN(myArray[i])) {
        modifyArray.push(myArray[i] + 1);
    }
    
    i++;
};
console.log(modifyArray);

// 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 = [
	'chayo',
    'andrew',
    'lara',
    'scott',
    'dan',
    'jordan',
   ...