String Length

Program to find length of a string

BeginnerTopic: String Programs

JavaScript String Length Program

This program helps you to learn the fundamental structure and syntax of JavaScript programming.

// Method 1: Using length property
let str = "Hello World";
console.log("String:", str);
console.log("Length:", str.length);

// Method 2: Manual count using loop
function stringLength(str) {
    let count = 0;
    for (let i = 0; i < str.length; i++) {
        count++;
    }
    return count;
}

console.log("\nManual count:", stringLength("JavaScript"));

// Method 3: Using split and length
function stringLengthSplit(str) {
    return str.split('').length;
}

console.log("Using split:", stringLengthSplit("Programming"));

// Method 4: Count without spaces
function stringLengthNoSpaces(str) {
    return str.replace(/\s/g, '').length;
}

console.log("\nLength without spaces:", stringLengthNoSpaces("Hello World"));

// Method 5: Count words
function countWords(str) {
    return str.trim().split(/\s+/).length;
}

console.log("Word count:", countWords("Hello World from JavaScript"));

Output

String: Hello World
Length: 11

Manual count: 10

Using split: 11

Length without spaces: 10

Word count: 4

Understanding String Length

This program demonstrates different ways to find string length.

Method 1: Length Property

Built-in property:

str.length;

Returns:

Number of characters (including spaces)

Method 2: Manual Count

Using loop:

let count = 0;
for (let i = 0; i < str.length; i++) {
    count++;
}

Method 3: Split and Length

Convert to array:

str.split('').length;

Split Method:

•Converts string to array

•Each character becomes array element

Method 4: Length Without Spaces

Remove spaces first:

str.replace(/\s/g, '').length;

Regular Expression:

•/\s/g: Matches all whitespace

•g: Global flag (all occurrences)

Method 5: Word Count

Count words, not characters:

str.trim().split(/\s+/).length;

String Methods:

•trim(): Removes leading/trailing spaces

•split(/\s+/): Splits on one or more spaces

Important Notes:

•length is a property, not a method

•Returns number of UTF-16 code units

•Special characters may count as 2

When to Use:

length property

: Standard, fastest

Manual count

: Learning

Split

: When you need array anyway

Let us now understand every line and the components of the above program.

Note: To write and run JavaScript programs, you need to set up the local environment on your computer. Refer to the complete article Setting up JavaScript Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your JavaScript programs.

Reverse a String