Beginner LevelJavaScript & TypeScript
How do template literals and string interpolation work in JavaScript?
❓ Interview Prompt: Explain template literal syntax, expression embedding, multi-line strings, and tagged templates.
Template literals use backticks (`) instead of quotes and support:
1
String Interpolation: Embed expressions with
${expression}.2
Multi-line Strings: Line breaks are preserved without \n escape characters.
3
Expression Evaluation: Any valid JS expression can be embedded: function calls, ternaries, arithmetic.
4
Tagged Templates: Custom function processes the template (used in styled-components, GraphQL, SQL sanitization).
Code Implementation Example
javascript
const name = 'Alice';
const age = 28;
// String interpolation
const greeting = `Hello, ${name}! You are ${age} years old.`;
// Multi-line string
const html = `
<div class="card">
<h2>${name}</h2>
<p>Age: ${age}</p>
</div>
`;
// Tagged template (custom processing)
function highlight(strings, ...values) {
return strings.reduce((result, str, i) =>
`${result}${str}<mark>${values[i] || ''}</mark>`, '');
}
const output = highlight`Name: ${name}, Age: ${age}`;💡String interpolation, multi-line templates, and tagged template functions.
🎯 Interview Key Takeaway
Use template literals for string concatenation. Tagged templates enable custom string processing like SQL injection prevention.
#Template Literals#Strings#ES6#Beginner
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