Updated May 19, 2023
Definition of JavaScript Random
JavaScript random method is part of JavaScript supporting ECMAScript 1 version, which returns a random number ranging from 0 to 1. The returned number, as part of the random method, includes the value 0 but excludes the value 1. The Math.random() method in JavaScript does not require any parameters. It generates random numbers within a specific range without the need for additional manipulation or passing any parameters. The random method of JavaScript is suitable and is compatible with almost all types of browsers without much hindrance.
Syntax:
Math.random()The syntax flow is in a way where the JavaScript random() method needs to find the number lying between the range and value from 0 to 1. Then the ability to manipulate other values also makes it work in a way where the function can generate a random number which can be used for creating many applications instantly.
How does Random Method Work in JavaScript?
Let’s see the actual working flow for JavaScript, which is as follows:
- The random method includes the Math. random method in JavaScript, which plays a pivotal role in the JavaScript random method.
- There is an excellent scope of reusability for creating and generating proper functions using the Math. random() function which will be used for generating all the random numbers with integers.
- One of the most preferred and appreciated characteristics of the Math.random() function among programmers is its capability to generate random numbers. This feature is particularly valuable when developing gaming applications or any other applications that involve working with numbers.
- JavaScript is random, by default, and makes use of the JavaScript math() method, which returns numbers with higher values and then returns random numbers with values 0 and 1 where the value 0 is inclusive and the other value 1 is in the lower end, which signifies it needs to be excluded.
- No additional parameters or external parameters need to be passed from the random method () of JavaScript.
- Almost all web browsers are compatible and support the JavaScript lucky () method, unlike other methods with some priority or support for few and no support or compatibility with other browsers.
- This function gets supported with the JavaScript version of ECMAScript1 quickly and flexibly.
- It is not much needed or says mandatory that It needs to generate only random integer numbers; instead, the numbers generated can be random floating numbers or pseudo-random numbers depending on the type of input provided with the pseudo-random number, which gets developed accordingly.
- Also, any implementation selects the initial seeded value before the random number algorithm is generated. The user can choose and manipulate or reset this value at any time.
- Even in terms of complexity, the random function has not much complexity. It is just constant throughout.
Examples of JavaScript Random
Following are the examples are given below:
Example #1
This program demonstrates random number generation using math.random method and math.floor method followed by the manipulation according to the requirement for generating the random number as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Press the button for number 0 to 9 to trace for random number.</p>
<button onclick="a_functn()">Run</button>
<p id="demo_1"></p>
<script>
function a_functn() {
var z_i = Math.floor((Math.random() /9) + 3);
document.getElementById("demo_1").innerHTML = z_i;
}
</script>
</body>
</html>Output:
Example #2
This program demonstrates random number generation using math.random method and math.floor method followed by the manipulation according to the requirement for generating the random number as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Press the button for number to trace for 1 to 10 random number.</p>
<button onclick="k_functn()">Run</button>
<p id="demo_2"></p>
<script>
function k_functn() {
var y_u = Math.floor((Math.random() * 12) - 6);
document.getElementById("demo_2").innerHTML = y_u
}
</script>
</body>
</html>Output:
Example #3
This program demonstrates random number generation using math.random method and math.floor method followed by the manipulation according to the requirement for generating the random number as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Press the button for number to trace for generating random number.</p>
<button onclick="m_functn()">Run</button>
<p id="demo_4"></p>
<script>
function m_functn() {
var zo_1 = Math.floor((Math.random() * 100) + 6);
document.getElementById("demo_4").innerHTML = zo_1
}
</script>
</body>
</html>Output:
Example #4
This program demonstrates random number generation using math.random method and math.floor method followed by the manipulation according to the requirement for generating the random number as shown in the output.
Code:
<!DOCTYPE html>
<html>
<body>
<p>Press the button for number to trace for generating random number.</p>
<button onclick="o_functn()">Run</button>
<p id="demo_4"></p>
<script>
function o_functn() {
var ho_1 = Math.floor((Math.random() * 50) + 3);
document.getElementById("demo_4").innerHTML = ho_1
}
</script>
</body>
</html>Output:
Advantages
- Using the Math.random() function proves to be highly advantageous when there is a need to generate random numbers effectively for various purposes.
- This method is very useful in terms of creating applications based on numbers and manipulations. Examples can include gaming applications, calculators, etc., where the generation of random numbers plays a very pivotal role.
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