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JavaScript - random float number in range with exclusive max value example
11 points
In JavaScript, it is possible to randomize a float number in a range with an exclusive max value in the following ways.
Quick solution:
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const min = 10; // inclusive2
const max = 15; // exclusive3
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const value = min + (max - min) * Math.random();5
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console.log(value);
In this section, you can find a reusable function that lets to generate random float numbers in the range.
The below function can be used in three cases:
randomFloat()
Returns a random number in the range0toNumber.MAX_VALUE(1.7976931348623157e+308)randomFloat(max)
Returns a random number in the range from0tomax.randomFloat(min, max)
Returns a random number in the range frommintomax.
Source code:
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/**2
* Generates random value in range.3
* 4
* @param min inclusive minimal value (used as max value when max argument is undefined)5
* @param max exclusive maximal value6
* 7
* @returns random float number in range <min, max)8
*/9
const randomFloat = (min, max) => {10
if (max == null) {11
max = (min == null ? Number.MAX_VALUE : min);12
min = 0.0;13
}14
if (min >= max) {15
throw new Error("Incorrect arguments.");16
}17
return min + (max - min) * Math.random();18
};19
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// Usage example:22
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console.log(randomFloat()); // 1.67319916301163e+30824
console.log(randomFloat(5)); // 2.759370593680191825
console.log(randomFloat(10, 80)); // 37.5452151438400526
console.log(randomFloat(-50, 50)); // -30.632843429520975