// A series of tests to demonstrate and practice use of ternary operator. document.write("Here are some tests using the ternary operator."); document.write("
"); // add some spaces document.write("
"); //Test whether person is old enough using ternary operator document.write("Here we will test if someone is old enough to get in."); document.write("
"); document.write("The minimum age is 18.") document.write("
"); var age = 42;//the age of the person trying to get in. document.write (" She is " + age + " years old."); document.write ("
"); /* Here is where the ternary operator comes in. It does a lot in a small space. Here the ternary tests whether it is true that the age is less than 18. If it is true the program outputs the first response after the question mark. If it is false, the program outputs the second response. */ var isAdult = (age < 18) ? " too young.": " old enough."; //Now we know the answer to the isAdult test. We'll tell the user. document.write("She is" + isAdult); document.write("
"); //add some spaces and linebreak document.write("
"); //test for enough height to go on a ride using ternary operator document.write("Here we will test to see if someone is tall enough to go on."); document.write("
"); document.write("The minimum height is 48 inches.") document.write("
"); var height = 52; //the height (in inches) of the person. document.write("She is " + height + " inches tall.")//tell user how tall. document.write("
"); /* Here the ternary tests whether the person is tall enough. If it is true that height is less than 48, it puts out the first answer. If not true, it puts out the second answer. */ var howTall = (height < 48) ? "not tall enough.": "tall enough."; //Now we know the answer to the howTall test. Let's tell the user. document.write("She is " + howTall); document.write("
"); document.write("
"); //test for which size category an engine is in. document.write("Here we will test which category an engine is in."); document.write("
"); document.write("Small engines are up to 150 hp, big engines are 150 and up."); var hp = 200; //the size of the engine in hp. document.write("
");//add a carriage return. var hp = 200;//the size in hp of the engine. document.write("The engine has " + hp + " horsepower."); document.write("
"); /* Here the ternary tests the size of the engine. If it is true that the engine hp is less than 150, it puts out the first answer. If it is not true that the hp is less thanl 150, it puts out the second. */ var engineSize = (hp < 150) ? " small Engine.": " big engine. "; //Now let's tell the user. document.write("The engine is a " + engineSize); // could be improved by taking input from user.

JavaScript ternary operator