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Examples

JavaScript Program to Find ASCII Value of Character

ASCII (American Standard Code for Information Interchange) values are numerical codes assigned to characters, enabling computers and electronic devices to process text. Each character corresponds to a unique ASCII value.

For example:

  • 'A' has an ASCII value of 65.

  • 'a' has an ASCII value of 97.

  • '0' has an ASCII value of 48.

This guide explores various ways to handle ASCII values in JavaScript, including how to retrieve ASCII values, print them, with explanation and output.

JavaScript Programs to Find ASCII Value of a Character Using charCodeAt

The charCodeAt method is the simplest way to find the ASCII value of a character.

Code

function findAsciiValue(character) {
    return character.charCodeAt(0);
}

// Test the function
const char = 'A';
console.log(`The ASCII value of '${char}' is:`, findAsciiValue(char));

Output

The ASCII value of 'A' is: 65

Explanation

The charCodeAt method returns the Unicode value of the character at the specified index, which corresponds to the ASCII value for standard characters.

JavaScript Program to Print ASCII Values of String Characters

This program prints the ASCII values for all characters in a string.

Code

function printAsciiValues(str) {
    for (let i = 0; i < str.length; i++) {
        console.log(`The ASCII value of '${str[i]}' is: ${str.charCodeAt(i)}`);
    }
}

// Test the function
const inputString = "Hello";
printAsciiValues(inputString);

Output

The ASCII value of 'H' is: 72
The ASCII value of 'e' is: 101
The ASCII value of 'l' is: 108
The ASCII value of 'l' is: 108
The ASCII value of 'o' is: 111

Explanation

  • The loop iterates over each character in the string and uses charCodeAt to find and print its ASCII value.

  • This method demonstrates how to print ASCII value in JavaScript for multiple characters.

Converting ASCII Values to Characters in JavaScript Using String.fromCharCode

To convert an ASCII value back to a character, use the String.fromCharCode method.

Code

function getCharacterFromAscii(asciiValue) {
    return String.fromCharCode(asciiValue);
}

// Test the function
const asciiValue = 65;
console.log(`The character for ASCII value ${asciiValue} is:`, getCharacterFromAscii(asciiValue));

Output

The character for ASCII value 65 is: A

Explanation

  • The String.fromCharCode method converts the ASCII value to its corresponding character.

  • This is useful for tasks where you need to get a character from ASCII value in JavaScript.

ASCII Value of Character in JavaScript Using codePointAt()

The codePointAt method provides a Unicode code point for a character, which is equivalent to its ASCII value for standard characters.

Code

function findAsciiUsingCodePoint(character) {
    return character.codePointAt(0);
}

// Test the function
const charCode = 'A';
console.log(`The ASCII value of '${charCode}' using codePointAt() is:`, findAsciiUsingCodePoint(charCode));

Output

The ASCII value of 'A' using codePointAt() is: 65

Explanation

  • The codePointAt method is useful for working with characters represented by Unicode code points, including extended characters.

  • For standard ASCII characters, codePointAt produces the same result as charCodeAt.

Concepts Used in Above Programs

charCodeAt Method

  • Retrieves the ASCII value of a character at a specified index in a string.

Loops

  • Used to iterate through strings and print ASCII values for each character.

String.fromCharCode Method

  • Converts an ASCII value back to its corresponding character.

codePointAt Method

  • Retrieves the Unicode code point for a character, equivalent to its ASCII value for standard characters.