JavaScript String length

Strings are a fundamental data type in JavaScript. They are used to represent text and are enclosed in single or double quotes. A string's length property returns the number of characters in the string.

Syntax

string.length

Example

let myString = "Hello, World!";
console.log(myString.length); // Output: 13

Explanation

In the example above, we create a string called myString with the value of "Hello, World!". We then log the length property of myString to the console which returns the value of 13.

Note that the length property counts all characters in the string, including spaces, punctuation, and special characters.

Caveats

The length property is a read-only property and cannot be set. Attempting to set the value of the length property will have no effect.

let myString = "Hello, World!";
myString.length = 5; // This has no effect
console.log(myString.length); // Output: 13

It's important to be aware of the length property's behavior when dealing with non-ASCII characters, as they may be represented by multiple UTF-16 code units. In such cases, the length property will not accurately reflect the number of visible characters in the string.

Conclusion

The length property of JavaScript strings is a simple but important feature that allows developers to quickly determine the size of a string. It is an essential tool for working with text in JavaScript.

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