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ClueBot NG (talk | contribs) m Reverting possible vandalism by 122.52.196.197 to version by Taumata994. Report False Positive? Thanks, ClueBot NG. (3819188) (Bot) |
Afitterling (talk | contribs) const in Javascript does not mean constant. As the variable is still mutable for complex types. Tags: Reverted Visual edit |
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{{short description|Type qualifier}}
{{lowercase title}}
In the [[C (programming language)|C]], [[C++]], [[D (programming language)|D]], [[JavaScript]] and [[Julia (programming language)|Julia]] [[programming language]]s, '''const''' is a [[type qualifier]]:{{efn|In D the term ''type constructor'' is used instead of ''type qualifier,'' by analogy with [[Constructor (object-oriented programming)|constructors in object-oriented programming]].}} a [[Keyword (computer programming)|keyword]] applied to a [[data type]] that indicates that the data is read only. (As for Javascript, Lists or Objects are still mutable but cannot be redefined). While this can be used to declare [[Constant (computer programming)|constants]], <code>const</code> in the C family of languages differs from similar constructs in other languages in being part of the ''type,'' and thus has complicated behavior when combined with [[Pointer (computer programming)|pointers]], references, [[composite data type]]s, and type-checking.
== Introduction ==
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