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

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Root-ssh

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

1. Custom random method example

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// 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