Advanced Usage of Template Strings JavaScript

Template strings, also referred as template literals is an important feature introduced in ECMAScript 6 (ES6) that brings to increase flexibility in working with strings in JavaScript.

In this article, we will discuss the template strings, their syntax, functionality, and benefits.

What are Template Strings?

Template strings are a type of string literals that enable for enclosed expressions within backticks ( ) rather of single or double quotes.

These expressions are indicated by the dollar sign and curly braces ${expression}.

The values of these expressions are estimated and then concatenated with the surrounding string.

Why Use Template Strings in JavaScript?

Template strings provide certain advantages over traditional string concatenation using quotes and the plus (+) operator:

• Simpler Syntax
  • The backticks and ${} syntax offer a cleaner and more readable method to make strings with embedded variables.
• Multiline Strings
  • Template strings can span several lines without needing an escape characters, executing a code more maintainable.
• Expression Evaluation
  • Embedded expressions enable for the evaluation of constant values, variables, or even function calls directly within the string.
• Tagged Template Literals
  • Advanced use cases require tagging template literals with functions to allow custom string transformations.

Usage and Example Codes

In this section, we will proceed in using template strings and provide practical examples to consolidate your understanding.

1. Basic Usage of Template Strings

To make a template string, enclose the content with backticks instead of single or double quotes.

For example:

const fullname = "Ricardo Octavio";
const message = `Hello, ${fullname}!`;
console.log(message);

Output:

Hello, Ricardo Octavio!

2. Multiline Template Strings

Traditional strings span a single line, involving the use of escape characters for multiline content.

With template strings, multiline content becomes uncomplicated.

Here’s an example:

const letter = `This is an example of multiline
string using template
strings JavaScript.`;

console.log(letter);

Output:

This is an example of multiline
string using template
strings JavaScript.

3. Expression Evaluation

Template strings allow the dynamic evaluation of expressions.

Let’s see an example:

const num1 = 20;
const num2 = 9;
const sumResult = `The sum of ${num1} and ${num2} is ${num1 + num2}.`;

console.log(sumResult);

Output:

The sum of 20 and 9 is 29.

4. Tagged Template Literals

Tagged template literals its require using a function to process the template.

For example:

function customTagTemplate(strings, ...values) {
  let resultSample = "";
  for (let x = 0; x < strings.length; x++) {
    resultSample += strings[x];
    if (values[x]) {
      resultSample += values[x].toUpperCase();
    }
  }
  return resultSample;
}

const message = "to the tutorial of";
const message2 = "Itsourcecode";message
const taggedStringResult = customTagTemplate`WELCOME, ${message} ${message2}.`;

console.log(taggedStringResult);

Best Practices in using Template String JavaScript

Here are the following best practices for using template strings effectively.

• Keep Code Readable
• Avoid Injection Vulnerabilities
• Use Template Tags Wisely

FAQs

Conclusion

In conclusion, template strings can increased string handling capabilities to JavaScript, making it simplier to create dynamic and readable code.

We also have discussed the basic syntax, benefits, and usage examples of template strings.

Additional Resources

• Timers in JavaScript: Enhancing Functionality and User Experience
• How to Throw Exception JavaScript?
• How to use String.valueOf() JavaScript?