Exercise Solutions - For Loop

js_stm_for.md

For Loops

Please follow the instructions below.

1. Create an HTML file named for_loop_js.html within the ~/vagrant-lamp/sites/codeup.dev/public folder on your Mac.

2. Using a for loop and inline JS, write the code to log to the console the following output.

   1
   22
   333
   4444
   55555
   666666
   7777777
   88888888
   999999999
   0000000000
   

   for (var i = 1; i <= 10; i++) {
   			
   	var log = '';
   	for (var j = 1; j <= i; j++) {
   		if (i==10) {
   			log += 0;
   		} else {
   			log += i;
   		}
   	};
   	console.log(log);
   };

3. Write the JS code to log to the console the multiplication table for a random number between 1 and 10. For instance, if the random number is 7, the console output should look like

   7x1=7
   7x2=14
   7x3=21
   7x4=28
   7x5=35
   7x6=42
   7x7=49
   7x8=56
   7x9=63
   7x10=70
   

   var rando = Math.ceil(Math.random()*10);
   var solution;
   
   for (var i = 1; i <= 10; i++) {
   	
   	solution  = rando * i;
   	console.log(rando+'x'+i+'='+solution);
   };

4. Using a for loop and the code to generate a random number from the previous lessons, generate 10 random numbers between 20 and 200 and output to the console whether each number is odd or even. For example:

   123 is odd
   80 is even
   24 is even
   199 is odd
   ...
   

   for (var i = 1; i <= 10; i++) {
   	var rando = Math.ceil(Math.random()*(200-20));	
   	var numstate = " is odd"; 
   	if (rando % 2 == 0) {
   		numstate = " is even";
   	};
   	console.log(rando+numstate);
   };

5. Use inline JavaScript to create a for loop that uses console.log to create the output shown below.

    100
    95
    90
    85
    80
    75
    70
    65
    60
    55
    50
    45
    40
    35
    30
    25
    20
    15
    10
    5
   

   solution:

   for (var i = 100; i > 0; i-=5) {
   	console.log(i);
   };