JavaScript: Convert a binary number to a decimal number
JavaScript Math: Exercise-2 with Solution
Write a JavaScript function to convert a binary number to a decimal number.
Test Data: console.log(bin_to_dec('110011')); console.log(bin_to_dec('100')); 51 4
Visual Presentation:
Sample Solution:
JavaScript Code:
// Define a function named bin_to_dec that takes a binary string as input and converts it to decimal.
function bin_to_dec(bstr) {
// Convert the binary string to a decimal integer using parseInt, removing any non-binary characters.
return parseInt((bstr + '').replace(/[^01]/gi, ''), 2);
}
// Output the decimal conversion of the binary string '110011' to the console.
console.log(bin_to_dec('110011'));
// Output the decimal conversion of the binary string '100' to the console.
console.log(bin_to_dec('100'));
Output:
51 4
Explanation:
In the exercise above,
- The code defines a function named "bin_to_dec()" which takes a binary string (bstr) as input.
- Inside the function, it converts the binary string to a decimal integer using the "parseInt()" function. The regular expression (/[^01]/gi, '') is used with "replace()" to remove any characters that are not '0' or '1' from the binary string.
- The "parseInt()" function is then used to convert the cleaned binary string to a decimal integer, specifying base 2 (binary) as the second argument.
- The function returns the decimal and integer representation of the binary string.
Flowchart:
Live Demo:
See the Pen javascript-math-exercise-2 by w3resource (@w3resource) on CodePen.
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