js-coding-challenges

Challenge 18: Convert Decimal to Binary.

Write a function that takes a decimal number as input and returns binary string. For example, if the input is 12, the function should return 1100.

Write a function called decimalToBinary that takes a decimal number as decimal in its parameter and returns binary string.

Answer 1

// Function to convert decimal numbers to binary strings
function decimalToBinary(decimal) {
    let binaryString = "";  // Initialize an empty string to store the binary digits

    // Perform repeated division by 2 until the decimal number becomes 0
    while (decimal > 0) {
        // Append the remainder of division (0 or 1) to the binary string
        binaryString = (decimal % 2) + binaryString;

        // Update the decimal number by integer division (floor division) by 2
        decimal = Math.floor(decimal / 2);
    }

    // Return the binary string
    return binaryString;
}

Answer 1 Explanation

In the decimalToBinary function, declare binaryString variable to store the binary string with empty string and then running a while loop until decimal is greater than one. Inside loop adding remainder in binaryString and dividing decimal itself by 2. After finishing the loop return binaryString.

Answer 2 using toString()

function decimalToBinary(decimal) {
    // Convert the decimal number to a binary string using the toString() method
    let binaryString = decimal.toString(2);

    // Return the binary string
    return binaryString;
}

Answer 2 Explanation

decimalToBinary the built-in toString() method with a base argument of 2. This method directly converts the decimal number to a binary string.

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