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Returns a subset of a String object.
Method of String
Syntax
substring( indexA, indexB )
Parameters
| Parameter | Description |
|---|---|
| indexA | An integer between 0 and 1 less than the length of the string that specifies the position of the first character. |
| indexB | An integer between 1 and the length of the string that is one greater than the position of the last character. |
Description
substring extracts characters from indexA up to but not including indexB. In particular:
- If indexA is less than 0, indexA is treated as if it were 0.
- If indexB is greater than stringName.length, indexB is treated as if it were stringName.length.
- If indexA equals indexB, substring returns an empty string.
- If indexB is omitted, indexA extracts characters to the end of the string.