How to use Round, Random, Min and Max in JavaScript

Round, Random, Min and Max in JavaScript are the methods used in math objects in JavaScript. Math object allows you to perform common mathematical tasks. The math object includes several mathematical values and functions. You do not need to define the math object before using it. In this article, I am describing the methods to use JavaScript mathematical functions such as Round, Random, Min, and Max with examples.

How to use Round() in JavaScript

Using round() method in math object, you can round the given numbers as given below.

<script>
document.write(Math.round(0.60) +"<br/>");
document.write(Math.round(0.40) +"<br/>");
document.write(Math.round(0.49) +"<br/>");
document.write(Math.round(-3.69) +"<br/>");
document.write(Math.round(-6.10) +"<br/>");
</script>

Preview:

Following is the preview generated while implementing the sample codes above that will show the examples of using round() method in math object.

Also Read: How to create Timer Using JavaScript?

How to use Random() in JavaScript

You can use the random() method in math object, you can return a random number between 0 and 1 as given below.

<script>
document.write(Math.random());
</script>

Preview:

You will get the random number as given below while using the JavaScript code shown above.

How to use Max() in JavaScript

Using max() method in math object, you can return the number with the highest value of two specified numbers as the following.

<script>
document.write(Math.max(9,3) +"<br/>");
document.write(Math.max(-5,7) +"<br/>");
document.write(Math.max(10,21) +"<br/>");
document.write(Math.max(-5,-9) +"<br/>");
document.write(Math.max(6.12,7.98) +"<br/>");
</script>

Preview:

Following is the preview generated while implementing the sample codes above that will show the examples of using max() method in math object.

Also Read: How to Click Button Using JavaScript?

How to use Min() in JavaScript

Using min() method in math object, you can return the number with the highest value of two specified numbers as the following.

<script>
document.write(Math.min(9,3) +"<br/>");
document.write(Math.min(-5,7) +"<br/>");
document.write(Math.min(10,21) +"<br/>");
document.write(Math.min(-5,-9) +"<br/>");
document.write(Math.min(6.12,7.98) +"<br/>");
</script>

Preview:

Following is the preview generated while implementing the sample codes above that will show the examples of using min() method in math object.

There are also other more methods on JavaScript math objects to perform common mathematical tasks which are listed below along with their description. You can use them as the methods given above.

• abs(x):  Returns the absolute value of a number
• ceil(x): Returns the value of a number rounded upwards to the nearest integer
• exp(x):  Returns the value or E^x.
• floor(x): Returns the value of a number rounded downwards to the nearest integer.
• log(x):  Returns the natural logarithm (base E) of a number.
• pow(x,y): Returns the value of x to the power of y.
• sqrt(x):  Returns the square root of a number.

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