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How do tagged template literals in JavaScript affect string interpolation and formatting?

Asked on Dec 04, 2025

Answer

Tagged template literals in JavaScript allow you to customize the processing of template literals, providing more control over string interpolation and formatting. They enable you to manipulate the template strings and their interpolated values before generating the final output.

<!-- BEGIN COPY / PASTE -->
        function tag(strings, ...values) {
            return strings.reduce((result, string, i) => {
                return `${result}${string}${values[i] ? values[i].toUpperCase() : ''}`;
            }, '');
        }

        const name = "world";
        const message = tag`Hello, ${name}!`;
        console.log(message); // Outputs: Hello, WORLD!
        <!-- END COPY / PASTE -->

Additional Comment:

The "tag" function processes the template literal, receiving "strings" (an array of string literals) and "values" (an array of interpolated values).
The "reduce" method combines the strings and values, transforming each value to uppercase before concatenation.
This example demonstrates how tagged template literals can modify interpolated values, such as converting them to uppercase.
Tagged template literals provide flexibility for custom string formatting and operations.

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Ask any question about JavaScript here... and get an instant response.

How do tagged template literals in JavaScript affect string interpolation and formatting?

Asked on Dec 04, 2025

Answer

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