How Can I Programmatically Convert a String to a Template Literal in JavaScript Safely?

Converting Strings to Template Strings programmatically

In Javascript, it's possible to define string templates using backticks ( ) or. However in some scenarios, you may encounter a situation where you have a string that resembles a template string but isn't one syntactically.

For instance, you might have a string resembling:

let a = "b:${b}";

And you would like to convert it to a valid template string later.

It's essential to note that using methods like eval or new Function for dynamic code generation is not recommended for security reasons. Instead. you can leverage the String.prototype.interpolate method, implemented in ES6 as follows:

String.prototype.interpolate = function(params) {
  const names = Object.keys(params);
  const vals = Object.values(params);
  return new Function(...names, `return \`${this}\`;`)(...vals);
};

Utilizing this method, you can transform your string in the following manner:

let b = 10;
console.log(a.interpolate({ b }));

The output will be b:10 which demonstrates the successful interpolation of variable b into the string a.

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