How Can I Efficiently Convert String Representations of Booleans to Their Intrinsic Boolean Type in JavaScript?

Can a String Representing a Boolean be Converted to Its Intrinsic Type in JavaScript?

Problem Statement:

You have a hidden HTML form dynamically filled with fields representing boolean values. After submitting the form, the intrinsic boolean values are converted into strings when saved in the hidden input fields. You seek a more efficient way to retrieve the intended boolean values from these strings.

Solution:

Do:

Employ the identity operator (===) to compare the string with 'true' or 'false' without implicit type conversions:

var isTrueSet = (myValue === 'true');

This method accurately determines the boolean value based on the exact string match, avoiding implicit type conversions that can cause false positives.

Case-Insensitive Comparison:

For case-insensitive comparison, consider these variants:

• Use a regular expression with the i flag:

  var isTrueSet = /^true$/i.test(myValue);

• Leverage optional chaining to account for possible undefined/null values:

  var isTrueSet = (myValue?.toLowerCase?.() === 'true');

Caution:

Avoid using the following methods for boolean conversion:

• Boolean("false"): Evaluates to true for string values.
• !!"": Evaluates to true for non-empty strings.

These methods return true for any non-empty string, which may not align with your intended boolean logic.

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