JavaScript Math log2() Method
Last Updated :
01 Aug, 2023
The Javascript Math.log2() is an inbuilt method in JavaScript that gives the value of base 2 logarithms of any number.
Syntax:
Math.log2(p)
Parameters: This method accepts a single parameter p which is any number whose base 2 logarithms is to be calculated.
Returns: It returns the value of base 2 logarithms of any number.
Let’s see some JavaScript code on this method:
Example 1: In this example, we will see the logs of various numbers using the Math.log2() method.
Javascript
console.log(Math.log2(1000));
console.log(Math.log2(12));
console.log(Math.log2(26));
console.log(Math.log2(5));
|
Output
9.965784284662087
3.584962500721156
4.700439718141092
2.321928094887362
Example 2: In this example, we will use a for loop to get the log of numbers that are a multiple of three upto 20.
Javascript
for (i = 3; i < 20; i += 3) {
console.log(Math.log2(i));
}
|
Output
1.584962500721156
2.584962500721156
3.169925001442312
3.584962500721156
3.9068905956085187
4.169925001442312
Errors and exceptions: Parameters for this method should always be a number otherwise it returns NaN i.e, not a number when its parameter is taken as a string.
Example 1: In this example, the Math.log2() method returns Nan as a string is passed in the method.
Javascript
console.log(Math.log2( "gfg" ));
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Example 2: This method gives an error when its parameter is taken as a complex number because it accepts only integer value as the parameter.
Javascript
console.log(Math.log2(1 + 2i));
|
Output:
Error: Invalid or unexpected token
Application:
Whenever we need the value of base 2 logarithms of any number that time we take the help of this method. Its value is needed many times in mathematics problems.
Let’s see the JavaScript code for this application:
Example 1: This example shows the demonstration of the above approach.
Javascript
function value_of_base_2_logarithms_of_any_number() {
return Math.log2(14);
}
console.log(value_of_base_2_logarithms_of_any_number());
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We have a complete list of Javascript Math methods, to check those please go through this JavaScript Math Object Complete Reference article.
Supported Browsers:
- Google Chrome 38 and above
- Edge 12 and above
- Firefox 25 and above
- Opera 25 and above
- Safari 8 and above
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