floating point - Get decimal portion of a number with JavaScript

Floating point - Get decimal portion of a number with JavaScript

To get the decimal portion of a number in JavaScript, you can use a combination of the modulo operator (%) and the Math.abs() function. Here's how you can do it:

function getDecimalPortion(number) { // Get the absolute value of the number var absoluteNumber = Math.abs(number); // Get the integer portion by flooring the absolute value var integerPortion = Math.floor(absoluteNumber); // Get the decimal portion by subtracting the integer portion from the absolute value var decimalPortion = absoluteNumber - integerPortion; // Return the decimal portion return decimalPortion; } // Example usage console.log(getDecimalPortion(3.14)); // Output: 0.14 console.log(getDecimalPortion(-123.456)); // Output: 0.456

In this code:

  • We first get the absolute value of the number using Math.abs(number) to handle negative numbers.
  • We then use Math.floor(absoluteNumber) to get the integer portion of the absolute value.
  • Finally, we subtract the integer portion from the absolute value to get the decimal portion.

This function will return the decimal portion of the input number as a positive value, regardless of the sign of the input number.

Examples

  1. "JavaScript get decimal part of number" Description: This query seeks methods or techniques to extract the decimal portion of a number in JavaScript, a common task when working with floating-point numbers.

    // Example code to get the decimal part of a number in JavaScript function getDecimal(number) { return number % 1; } // Usage var number = 10.75; var decimalPart = getDecimal(number); console.log("Decimal Part: " + decimalPart);

  2. "JavaScript extract fractional part" Description: Extracting the fractional part or decimal portion of a number is essential for various mathematical and computational tasks. This query might be seeking information on how to accomplish this in JavaScript.

    // Example code to extract the fractional part of a number in JavaScript function getFractional(number) { return number - Math.floor(number); } // Usage var number = 15.25; var fractionalPart = getFractional(number); console.log("Fractional Part: " + fractionalPart);

  3. "JavaScript parseFloat decimal part" Description: The parseFloat function in JavaScript parses a string and returns a floating-point number. This query may be looking for information on how to extract the decimal part of a parsed float using parseFloat.

    // Example code using parseFloat to extract decimal part in JavaScript var numberString = "25.75"; var number = parseFloat(numberString); var decimalPart = number - Math.floor(number); console.log("Decimal Part: " + decimalPart);

  4. "JavaScript decimal part regex" Description: Regular expressions (regex) can be used to extract specific patterns from strings in JavaScript. This query might be seeking a regex pattern to extract the decimal part of a number from a string representation.

    // Example code using regex to extract decimal part in JavaScript var numberString = "35.45"; var decimalPart = parseFloat(numberString.replace(/^-?\d+(\.\d+)?/, "")); console.log("Decimal Part: " + decimalPart);

  5. "JavaScript Math decimal part" Description: The Math object in JavaScript provides various mathematical functions and constants. This query may be looking for how to utilize Math functions to extract the decimal part of a number.

    // Example code using Math functions to extract decimal part in JavaScript var number = 42.87; var decimalPart = number - Math.trunc(number); console.log("Decimal Part: " + decimalPart);

  6. "JavaScript split decimal part" Description: Splitting a number into its integer and decimal parts is a common operation in JavaScript. This query might be seeking information on how to split a number to obtain its decimal part.

    // Example code to split decimal part of a number in JavaScript function splitDecimal(number) { var integerPart = Math.trunc(number); var decimalPart = number - integerPart; return decimalPart; } // Usage var number = 55.33; var decimalPart = splitDecimal(number); console.log("Decimal Part: " + decimalPart);

  7. "JavaScript get digits after decimal" Description: Extracting digits after the decimal point is a common requirement in JavaScript programming. This query may be looking for methods to achieve this efficiently.

    // Example code to get digits after decimal in JavaScript function getDigitsAfterDecimal(number) { var str = number.toString(); var index = str.indexOf("."); if (index !== -1) { return str.substring(index + 1); } return ""; } // Usage var number = 67.12345; var digitsAfterDecimal = getDigitsAfterDecimal(number); console.log("Digits After Decimal: " + digitsAfterDecimal);

  8. "JavaScript modulus decimal part" Description: The modulus operator (%) in JavaScript can be used to find the remainder of a division operation. This query might be seeking information on how to utilize the modulus operator to extract the decimal part of a number.

    // Example code using modulus operator to extract decimal part in JavaScript function getDecimal(number) { return number % 1; } // Usage var number = 123.456; var decimalPart = getDecimal(number); console.log("Decimal Part: " + decimalPart);

  9. "JavaScript decimal part toFixed" Description: The toFixed() method in JavaScript converts a number into a string, keeping a specified number of decimals. This query may be seeking information on how to use toFixed() to extract the decimal part of a number.

    // Example code using toFixed() to extract decimal part in JavaScript var number = 78.123456; var decimalPart = parseFloat(number.toFixed(2)); console.log("Decimal Part: " + decimalPart);

  10. "JavaScript number split decimal" Description: Splitting a number into its integer and decimal parts using string manipulation is a common approach in JavaScript. This query might be looking for information on how to achieve this using string splitting techniques.

    // Example code to split decimal part of a number in JavaScript function splitDecimal(number) { var parts = number.toString().split("."); if (parts.length === 2) { return parseFloat("0." + parts[1]); } return 0; } // Usage var number = 99.876; var decimalPart = splitDecimal(number); console.log("Decimal Part: " + decimalPart);

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