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.
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
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
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
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