JavaScript: Convert a number from one base to another

JavaScript Math: Exercise-1 with Solution

Base Conversion Between Bases 2-36

Write a JavaScript function to convert a number from one base to another.

Sample Solution:

JavaScript Code:

var base_convert = function(number, initial_base, change_base) {
 if (initial_base<2 || change_base<2 || initial_base>36 || change_base>36)
    return 'Base between 2 and 36';
    return parseInt(number + '', initial_base)
    .toString(change_base);
}
console.log(base_convert('E164',16,8));
console.log(base_convert(1000,2,8));
console.log(base_convert(10,1,2));
console.log(base_convert(10,-2,2)); 

Output:

160544
10
Base between 2 and 36
Base between 2 and 36

Explanation:

In the exercise above,

• Function base_convert():
• The code defines a function named "base_convert()" which takes three parameters: 'number', 'initial_base', and 'change_base'. This function is designed to convert numbers from one base to another.
• Input validation:
• The function checks if either 'initial_base' or 'change_base' is less than 2 or greater than 36. If either condition is true, it returns the message 'Base between 2 and 36', indicating that the base should be within the valid range of 2 to 36.
• Number conversion:
• If the input bases are valid, the function converts the input 'number' to an integer using parseInt(number + '', initial_base). The "parseInt()" function parses a string argument and returns an integer of the specified radix (the 'initial_base' in this case).
• Then, it converts the obtained integer to a string representation in the desired base using .toString(change_base). This converts the number to the specified 'change_base'.
• The function returns the converted number as a string.
• Finally the code demonstrates two function calls using console.log():
• console.log(base_convert('E164', 16, 8));: This converts the hexadecimal number 'E164' to octal base (8) and prints the result.
• console.log(base_convert(1000, 2, 8));: This converts the decimal number 1000 from binary base (2) to octal base (8) and prints the result.

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that converts a number from one base to another using recursion and validates that both bases are between 2 and 36.
• Write a JavaScript function that performs base conversion by iteratively dividing the number and collecting remainders, then mapping them to appropriate digits.
• Write a JavaScript function that converts a string-represented number from one base to another, ensuring error handling for invalid characters.
• Write a JavaScript function that converts numbers between bases 2 and 36 and formats the result with uppercase letters for bases above 10.

Improve this sample solution and post your code through Disqus.

Previous: javascript Math Exercises
Next: Write a JavaScript function to convert a binary number to a decimal number.