How Can I Perform Case-Insensitive String Comparisons in JavaScript?

Case-Insensitive String Comparison in JavaScript

Performing case-insensitive string comparisons is frequently required in JavaScript. How can case-insensitive comparisons be implemented effortlessly?

Although localeCompare is a modern technique for achieving this, an earlier solution involved using toUpperCase.

This method converts both strings to uppercase using the toUpperCase() function before comparing them. This approach is adequate for basic string comparisons without considering Unicode complexities.

For example, the following code demonstrates this technique:

var areEqual = string1.toUpperCase() === string2.toUpperCase();

By using this method, case differences between strings are eliminated, enabling reliable comparisons without regard to letter casing.

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