Dynamic Strings in JavaScript

Creating strings that are dynamic can be done a couple different ways. This doesn't include template literals. (See Template Literals).

1. Concatenation Using Plus Operator (+)

The most basic method for creating dynamic strings is using the + operator to concatenate strings with variables or other strings.

• Example:
  

  let user = 'Alice';  
  let greeting = 'Hello, ' + user + '!';  
  console.log(greeting);  // Output: Hello, Alice!  
  

2. concat() Method

The concat() method concatenates two or more strings and returns a new string.
This is a method of the String object.

let str1 = 'Hello, ';
let str2 = 'Alice';
let str3 = '!';
let greeting = str1.concat(str2, str3);
console.log(greeting);  // Output: Hello, Alice!

3. join() Method with Arrays

You can create an array of string elements and then use join() to concatenate them into a single string.

let words = ['Hello', 'Alice', '!'];
let greeting = words.join(' ');
console.log(greeting);  // Output: Hello Alice !

4. String replace() Method

The replace() method can be used to create dynamic strings by replacing parts of a string with dynamic values. It's especially useful for templating.

let template = 'Hello, {user}!';
let greeting = template.replace('{user}', 'Alice');
console.log(greeting);  // Output: Hello, Alice!