The Math.log() function in JavaScript is used to return the natural logarithm (base e) of a number.
The JavaScript Math.log() function is equivalent to ln(x) in mathematics.
If the value of x is negative, then math.log() function return NaN.
log() is a static method of Math, therefore, it is always used as Math.log(), rather than as a method of a Math object created.
Syntax:
Math.log(value)
Parameters Used:
Value:A number whose natural logarithm you want to find.
Return Value:
The Math.log() function returns the natural logarithm given number.
Examples:
- When zero is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.log(0));
</
script
>
Output:
Output : -Infinity
- When “-1” is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.log(-1));
</
script
>
Output:
Output : NaN
- When “10” is passed as a parameter.
<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.log(10));
</
script
>
Output:
Output : 2.302585092994046
- Calculating Math.log() with a different base.
For finding the logarithm of 8 with base 2,execute the math.log() function in the following way:<
script
type
=
"text/javascript"
>
document.write("Output : " + Math.log(8)/Math.log(2));
</
script
>
Output:
Output : 3
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