Why Aren't My JavaScript Template Literals Substituting Variables?

Troubleshooting Template Literals: Resolving Variable Substitution Issue

Template literals, denoted by backticks () instead of straight quotation marks, enable developers to embed expressions within strings. However, you may encounter an issue where template literals like 'some ${string}' or "some ${string}"` fail to substitute variable names with their values.

Cause:

This issue arises when straight quotation marks (single or double) are used instead of backticks.

Solution:

To resolve this problem, simply replace the straight quotation marks surrounding the template literal with backticks, like so:

console.log(`categoryName: ${this.categoryName}\ncategoryElements: ${this.categoryElements} `)

Explanation:

JavaScript template literals utilize backticks as delimiters. This distinction separates them from regular strings, which employ straight quotation marks. By using backticks, you instruct JavaScript to parse and evaluate any expressions embedded within the template literal, resulting in the substitution of variable values.

Example:

Consider the following code:

categoryName="name";
categoryElements="element";
console.log(`categoryName: ${this.categoryName}\ncategoryElements: ${categoryElements} `)

This code will output:

categoryName: name
categoryElements: element

In contrast, if you used straight quotation marks, the output would appear as follows:

${this.categoryName}
categoryElements: ${this.categoryElements}

This illustrates how straight quotation marks treat the template literal as a regular string, retaining the literal variable names instead of evaluating the expressions within.

Reference:

• [Usage of the backtick character () in JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Template_literals#Usage_of_the_backtick_character_)

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