Copy a string: Difference between revisions
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=={{header|Tcl}}==
<lang tcl>set src "Rosetta Code"
Tcl copies strings internally when needed. To be exact, it uses a basic value model based on simple objects that are immutable when shared (i.e., when they have more than one effective reference to them); when unshared, they can be changed because the only holder of a reference has to be the code requesting the change. At the script level, this looks like Tcl is making a copy when the variable is assigned as above, but is more efficient in the common case where a value is not actually modified.
=={{header|Toka}}==
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