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
// Different numbers are being taken// as the parameter of the method.console.log(Math.log2(1000));console.log(Math.log2(12));console.log(Math.log2(26));console.log(Math.log2(5)); |
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
// Taken parameter from 1 to 19 incremented by 3.for (i = 3; i < 20; i += 3) { console.log(Math.log2(i));} |
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
// Parameters for this method should always be a// number otherwise it return NaN i.e, not a number// when its parameter taken as string.console.log(Math.log2("gfg")); |
NaN
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
// Parameters can never be a complex number because// it accept only integer value as the parameter.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
// taking parameter as number 14 and //calculated in the form of method.function value_of_base_2_logarithms_of_any_number() { return Math.log2(14);}console.log(value_of_base_2_logarithms_of_any_number()); |
3.807354922057604
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
