Exercise – Operators & Control Structures

by phate101101

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 input = prompt("Enter a number: " );
input % 2 === 0  ? alert("Even") : alert("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("Age?: " );
if(age >= 70) alert("you look great!")
else if ( age <= 18) alert("You should be in school!")
else alert("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 ){
    if(typeof myArray[i] === 'number') {
        myArray[i]++;
    }

i++;    
}
console.log(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 = ["John", "Sally", "Nick"];
function combine(y){
    var combined = ""
    for (i in y){
		combined = combined + names[i] + ", ";
	}
    return combined;
}
combine(names);

console.log(combined);
console.log(names);