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  • Go

Idiom #288 Check if set contains a value

Set the boolean b to true if the set x contains the element e, false otherwise.

_, b := x[e]

x has type map[E]struct{}
b := x[e]

x has type map[E]bool
b = x.find(e) != x.end();
New implementation...
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programming-idioms.org 
_, b := x[e]
b := x[e]
b = x.find(e) != x.end();
b = x.Contains(e);
var b = x.contains(e);
b = x(e)
b = e `member` x
let b = x.has(e);
boolean b = x.contains(e);
(setf b (not (null (member e x))))
b := e in x;
$b = $x{$e};

b = e in x
b = x.include? e
let b = x.contains(&e);