How to use template strings in TypeScript

In TypeScript, template strings, also known as template literals, are a way to work with string interpolation and multiline strings more conveniently. Template strings are enclosed by backticks (`) instead of single or double quotes. Here's how you can use template strings in TypeScript:

1. Basic String Interpolation:

   You can embed expressions inside template strings using ${}:

   typescriptCopy code
   let name: string = "John";
   let age: number = 25;
   
   let message: string = `My name is ${name} and I am ${age} years old.`;
   
   console.log(message);
   

   This will output: My name is John and I am 25 years old.

2. Multiline Strings:

   Template strings also allow for multiline strings without the need for concatenation or escape characters:

   typescriptCopy code
   let multilineString: string = `
   This is a multiline string.
   It spans multiple lines.
   No need for escape characters or concatenation.
   `;
   
   console.log(multilineString);
   

3. Tagged Templates:

   You can use tagged templates to process template literals with a function. The tag function receives the template literals and the interpolated values as separate arguments:

   typescriptCopy code
   function customTag(strings: TemplateStringsArray, ...values: any[]): string {
       let result: string = "";
   
       for (let i = 0; i < strings.length; i++) {
           result += strings[i];
   
           if (i < values.length) {
               result += values[i];
           }
       }
   
       return result;
   }
   
   let firstName: string = "John";
   let lastName: string = "Doe";
   
   let customMessage: string = customTag`Hello, my name is ${firstName} ${lastName}.`;
   
   console.log(customMessage);
   

   This will output: Hello, my name is John Doe.

These are some basic examples of how to use template strings in TypeScript. They provide a concise and expressive way to work with strings and variable interpolation.