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How to Defer Template Literal Execution in ES6?

Nov 09, 2024 pm 01:51 PM

How to Defer Template Literal Execution in ES6?

Deferring Template Literal Execution in ES6

In ES6, template literals provide a powerful way to embed dynamic values into strings. However, when using string interpolation within template literals, the values are evaluated before the template literal is processed by custom string manipulation methods. This can lead to undesired results when deferring the execution of the template literal.

To address this, there are several approaches one can consider:

1. Utilize Template Strings

Avoid using string interpolation within template literals and instead opt for template strings as intended. For instance:

console.log(`Hello, ${"world"}. This is a ${"test"}`);
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2. Employ Tagged Template Literals

Leverage tagged template literals to execute code after the template literal substitutions have been evaluated. However, it's important to note that the substitutions themselves are still evaluated immediately:

function formatter(literals, ...substitutions) {
  return {
    format: function() {
      // Implementation for value substitution and template literal concatenation
    }
  };
}
console.log(formatter`Hello, <pre class="brush:php;toolbar:false">String.prototype.format = function() {
  var args = arguments;
  return this.replace(/$\{p(\d)\}/g, function(match, id) {
    return args[id];
  });
};
console.log("Hello, ${p0}. This is a ${p1}".format("world", "test"));
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. This is a `.format("world", "test"));

3. Use Plain String Literals with Custom String Manipulation

Create a custom string manipulation function to format the string later in the code, after values have been retrieved dynamically:

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