JavaScript - generate array with 10 random numbers
In this article, we would like to show you how to generate array with 10 random numbers in JavaScript.
Quick solution:
xxxxxxxxxxconst array = Array(10) // array size is 10 .fill() .map(() => 50 * Math.random()); // numbers from 0-50 (exclusive)console.log(array);Note:
Use
Math.floor()to get integers instead of float numbers. You can find practical examples in the sections below.
In this example we take the following steps:
- Create an array with size
10, - Use
fill()method to fill thearraywith specified values, - use
map()method to callMath.random()to generate a random value for each element in thearray(from 0-50 exclusive).
Practical example:
xxxxxxxxxxconst array = Array(10) // array size is 10 .fill() .map(() => 50 * Math.random()); // numbers from 0-50 (exclusive)console.log(array);If you want to receive integers instead of float numbers use Math.floor() method:
Practical example:
xxxxxxxxxxconst array = Array(10) // array size is 10 .fill() .map(() => Math.floor(50 * Math.random())); // numbers from 0-50 (exclusive)console.log(array);
In this example, we use Array.from() method to create an array with size 10 and fill it with random numbers.
Practical example:
xxxxxxxxxx// The solution for ES6+const array = Array.from({ length: 10 }, () => Math.random() * 50);console.log(array);If you want to receive integers instead of float numbers use Math.floor() method:
Practical example:
xxxxxxxxxx// The solution for ES6+const array = Array.from({ length: 10 }, () => Math.floor(Math.random() * 50));console.log(array);
In this example, you can find solution that lets to randomize arrays using embedded crypto object.
Source code:
xxxxxxxxxxconst randomArray = (length, constructor = Uint32Array) => { const array = new constructor(length); return crypto.getRandomValues(array);};// Usage example:console.log(randomArray(5, Uint8Array)); // also: Int8Arrayconsole.log(randomArray(5, Uint16Array)); // also: Int16Arrayconsole.log(randomArray(5, Uint32Array)); // also: Int32Arrayconsole.log(randomArray(5, BigUint64Array)); // also: BigInt64ArrayNote: the solution was intruduced in major web browsers in 2011-2014.
