javascript tutorial - [Solved-5 Solutions] Generating random whole numbers in JavaScript in a specific range - javascript - java script - javascript array
Problem:
How to generate a random whole number between two specified variables in JavaScript
Solution 1:
/**
* Returns a random number between min (inclusive) and max (exclusive)
*/
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
/**
* Returns a random integer between min (inclusive) and max (inclusive)
* Using Math.round() will give you a non-uniform distribution!
*/
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
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Solution 2:
var randomnumber = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
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Solution 3:
function getRandomizer(bottom, top) {
return function() {
return Math.floor( Math.random() * ( 1 + top - bottom ) ) + bottom;
}
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usage:
var rollDie = getRandomizer( 1, 6 );
var results = ""
for ( var i = 0; i<1000; i++ ) {
results += rollDie() + " "; //make a string filled with 1000 random numbers in the range 1-6.
}
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Solution 4:
// Returns a random integer between min and max
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
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Useful Examples:
// 0 - 10
Math.floor(Math.random() * 11);
// 1 - 10
Math.floor(Math.random() * 10) + 1;
// 5 - 20
Math.floor(Math.random() * 16) + 5;
// -10 - (-2)
Math.floor(Math.random() * 9) - 10;
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Solution 5:
function randomRange(min, max) {
return ~~(Math.random() * (max - min + 1)) + min
}