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JavaScript - random float number in range with inclusive max value example

11 points
Created by:
Root-ssh
68500

In JavaScript it is possible to randomize float number in range with inclusive max value in following way.

1. Custom random method example

// ONLINE-RUNNER:browser;

// Generates values from <0, 1>
function randomizeValue() {
	var value = (1 + 10E-16) * Math.random();
  
  	if (value > 1.0) {
    	return 1.0;
    }
  
  	return value;
}

/*
	inclusive min (result can be equal to min value)
    inclusive max (result will not be to max value)
*/
function randomizeFloat(min, max) {
  	if(max == null) {
    	max = (min == null ? Number.MAX_VALUE : min);
      	min = 0.0;
    }
  
  	if(min >= max) {
    	throw new Error("Incorrect arguments.");
    }

    return min + (max - min) * randomizeValue();
}

// Example:

console.log(randomizeFloat()); // 1.1960373039711962e+308
console.log(randomizeFloat(5)); // 0.7663988388633522
console.log(randomizeFloat(10, 80)); // 67.81113931017913
console.log(randomizeFloat(-50, 50)); // -13.713816892801674

See also

  1. JavaScript - Math.random() method example
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