Difference between revisions of "The String Concatenation"
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===The String Concatenation=== | ===The String Concatenation=== | ||
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For example, if we have an expression: “1” + 6, its value is a string: “16”. | For example, if we have an expression: “1” + 6, its value is a string: “16”. | ||
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| + | ===Invariant strings=== | ||
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| + | Strings are invariant, meaning that an existing string cannot be changed. | ||
| + | Therefore when making a string concatenation, a new string must be allocated. | ||
| + | |||
| + | If this is done excessively, e.g. in a loop, this may result in severe performance degradation of the script and possible the whole server. | ||
| + | |||
| + | Use the [[StringBuilder_class|StringBuilder]] when it is necessary to do this kind of processing. | ||
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__NOTOC__ | __NOTOC__ | ||
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Latest revision as of 14:31, 10 February 2012
The String Concatenation
CGS uses operator ‘+’ for concatenating string expressions. When the operator ‘+’ is used between a string and a number expression, the number expression will be converted to a string and then concatenated to the string expression.
For example, if we have an expression: “1” + 6, its value is a string: “16”.
Invariant strings
Strings are invariant, meaning that an existing string cannot be changed. Therefore when making a string concatenation, a new string must be allocated.
If this is done excessively, e.g. in a loop, this may result in severe performance degradation of the script and possible the whole server.
Use the StringBuilder when it is necessary to do this kind of processing.
