A for loop can find the length of a string in JavaScript by iterating through each character, incrementing a counter for each iteration, and the final count represents the length.
Calculating string bytes is crucial for internationalization and character encoding, which can be achieved using functions like TextEncoder to determine memory usage for strings.
In scenarios where a string is null or undefined, accessing the length property can cause errors; setting a default length of 0 helps avoid potential issues with undefined strings.
The JavaScript string length property counts 16-bit code units instead of Unicode characters, leading to unexpected outcomes, especially with characters beyond the Basic Multilingual Plane.
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