How to Use the String length Property in JavaScript
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Contents
In this article, you will learn how to use the string length property in JavaScript.
Using the string length property in JavaScript
The length property is a built-in property of JavaScript strings. It returns the number of characters in a string. Here’s how to use the length property in JavaScript:
Accessing the length property
To access the length property of a string, simply append .length to the end of the string variable. For example:
let myString = "Hello, world!";
console.log(myString.length); // Output: 13
Using the length property in a conditional statement
The length property can be used in conditional statements to check if a string meets a certain length requirement. For example:
let myString = "Hello, world!";
if (myString.length > 10) {
console.log("String is long enough");
} else {
console.log("String is too short");
}
// Output: String is long enough
Concatenating strings using the length property
The length property can also be used to concatenate strings. For example:
let str1 = "Hello";
let str2 = "World";
let str3 = "!";
let combinedString = str1 + str2 + str3;
let lengthOfCombinedString = combinedString.length;
console.log(combinedString); // Output: "HelloWorld!"
console.log(lengthOfCombinedString); // Output: 11
Using the length property with the slice() method
The slice() method is used to extract a portion of a string. The length property can be used to determine the end point of the slice. For example:
let myString = "Hello, world!";
let slicedString = myString.slice(0, 5);
console.log(slicedString); // Output: "Hello"
Here, 0 is the starting index, and 5 is the end index (exclusive).