charCodeAt

public unsigned short+ charCodeAt(int index)

The Unicode value for the character. undefined is returned if the index is out of range.

Parameters

index

The position of the character.

Gets the Unicode value of a character at a given position.

If the index is out of range (e.g. negative number or greater than the length of the string), undefined will be returned.

charCodeAt was inherited from JavaScript (ES3). Use the JS++ method String.codePointAt instead. charCodeAt will not return values above 0x10000 (65536).

Performance

This method uses existent types for safety, which requires runtime bounds checking. In browser environments, where performance is critical, consider casting the string to external before calling charCodeAt on it. In other environments, casting to external may not provide a discernable performance improvement, and it may even decrease performance.

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import System;   string abc = "abc"; Console.log(abc.charCodeAt(0)); // 97 Console.log(abc.charCodeAt(1)); // 98 Console.log(abc.charCodeAt(2)); // 99