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Table of contents
1.
Introduction
2.
Why This Function is Used
3.
Syntax, Parameter and Return Value
3.1.
Syntax:
3.2.
Parameters:
3.3.
Return Value:
4.
Examples 
4.1.
Basic Template Compilation and Usage:
4.2.
JavaScript
4.3.
Using Template with HTML:
4.4.
JavaScript
4.5.
Executing JavaScript Code in Templates:
4.6.
JavaScript
4.7.
Customizing Delimiters:
4.8.
JavaScript
5.
Frequently Asked Questions
5.1.
How does _.template() differ from other templating engines?
5.2.
Can _.template() handle complex logic inside templates?
5.3.
Is it safe to use _.template() with user-provided data?
6.
Conclusion
Last Updated: Mar 27, 2024
Easy

Lodash _.template() Method

Introduction

Creating dynamic strings from templates is a frequent requirement in web development, email generation, and various other programming scenarios. Lodash's _.template() method offers a powerful solution for this, allowing developers to create template functions for generating strings with embedded JavaScript values. 

Lodash _.template() Method

This method is especially useful when you need to inject data into predefined text formats, such as rendering HTML with dynamic content, generating customized messages, or formatting complex data for display.

Why This Function is Used

The _.template() function is used to compile text templates into functions that can interpolate data. This is crucial for cases where you need to dynamically insert variables or execute JavaScript code within a string, allowing for more flexible and maintainable code, especially in scenarios where string content changes based on user data or application state.

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Syntax, Parameter and Return Value

Syntax:

 _.template([string=''], [options={}])

Parameters:

  • [string=''] (string): The template string.
     
  • [options={}] (Object): The options object.

Return Value:

 (Function) - Returns the compiled template function.

Examples 

Basic Template Compilation and Usage:

  • JavaScript

JavaScript

var _ = require('lodash');

var compiled = _.template('Hello <%= user %>!');

console.log(compiled({ 'user': 'Fred' }));

Output: 

'Hello Fred!'


Demonstrates compiling a basic template and injecting a variable.

Using Template with HTML:

  • JavaScript

JavaScript

var templateString = '<h1><%= title %></h1><p><%= message %></p>';

var compiledHtml = _.template(templateString);

var html = compiledHtml({ title: 'Important', message: 'This is a message' });

console.log(html);

Output:

 '<h1>Important</h1><p>This is a message</p>'


Shows compiling an HTML template and injecting multiple variables.

Executing JavaScript Code in Templates:

  • JavaScript

JavaScript

var compiled = _.template('<% _.forEach(users, function(user) { %><li><%= user %></li><% }); %>');

var userList = compiled({ 'users': ['Fred', 'Barney'] });

console.log(userList);

Output: 

'<li>Fred</li><li>Barney</li>'


An example of using a forEach loop within a template to generate a list of users.

Customizing Delimiters:

  • JavaScript

JavaScript

var customCompiled = _.template('Hello {{ user }}!', { 'interpolate': /{{([\s\S]+?)}}/g });

console.log(customCompiled({ 'user': 'Ted' }));

Output:

 'Hello Ted!'


Demonstrates customizing the interpolation delimiters in a template.

Frequently Asked Questions

How does _.template() differ from other templating engines?

_.template() is a part of Lodash, which means it integrates seamlessly with other Lodash functionalities. It offers simplicity and ease of use, particularly for smaller-scale templating needs, compared to more complex templating engines.

Can _.template() handle complex logic inside templates?

Yes, _.template() can execute complex JavaScript logic within templates, but it's recommended to keep the logic within templates simple for maintainability.

Is it safe to use _.template() with user-provided data?

When using user-provided data, it's important to sanitize and escape the data to prevent injection attacks, especially in web applications.

Conclusion

Lodash's _.template() method is an effective tool for generating dynamic strings from templates, offering the flexibility to interpolate data and execute JavaScript within string templates. It's useful for a wide range of scenarios, from web development to automated messaging systems.

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