Javascript Course

The Math.random() JavaScript method returns a floating-point random number between 0 (inclusive) and 1 (not included).
This method can be used to generate random integer numbers in JavaScript.
Bellow there are 3 functions with examples to generate random integer numbers with various criterias.


Examples random numbers in JS

1. The randomNr() function from the following example returns a random integer between a minimum and maximum number.
//Returns a random integer between min (inclusive) and max (inclusive)
function randomNr(min, max){
 return Math.floor(Math.random() * (max - min + 1)) + min;
}

//Test
var nr_al = randomNr(1, 9999);
document.write(nr_al); //78 /355 /7098
2. The randNrDigits() function presented in the following example returns a random integer with a specified number of digits.
//Returns a random integer with a specified number of digits (nd)
function randNrDigits(nd){
 var n0 =1;
 for(var i=1; i<nd; i++) n0 +='0';
 return Math.floor((1*n0) + Math.random() * (9*n0));
}

//Test
var nr_al = randNrDigits(4);
document.write(nr_al); //3424
3. The randNrUniqueDigits() function from the following example returns a random integer with a specified number of digits, and the digits do not repeat.
//Returns a random integer with digits that not repeat, with specified number of digits (nd)
function randNrUniqueDigits(nd){
 var ar_nr =[0,1,2,3,4,5,6,7,8,9];
 for(let i = ar_nr.length -1; i >0; i--){
 let j = Math.floor(Math.random() * (i + 1)); 
 [ar_nr[i], ar_nr[j]] = [ar_nr[j], ar_nr[i]];
 }

 return ar_nr.splice(1, nd).join('')*1;
}

//Test
var nr_al = randNrUniqueDigits(4);
document.write(nr_al); //5940

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which HTML5 tag is indicated to be used as container for menu with navigation links in Web site?
<section> <nav> <article>
<nav><ul>
 <li><a href="http://coursesweb.net/css/" title="CSS Course">CSS Course</a></li>
 <li><a href="http://www.marplo.net/jocuri/" title="Flash Games">Flash Games</a></li>
</ul></nav>
Which CSS property shifts an item horizontally to the left or right of where it was?
text-align clear float
.some_class {
  width: 30%;
  float: left;
}
Click on the Math object method which returns x, rounded downwards to the nearest integer.
Math.ceil(x) Math.abs(x) Math.floor(x)
var num = 12.34567;
num = Math.floor(num);
alert(num);       // 12
Indicate the PHP function which returns the number of characters in string.
mb_strlen() count() stristr()
$str = "string with utf-8 chars åèö";
$nrchr = mb_strlen($str);
echo $nrchr;        // 30
Generate random numbers in JavaScript

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