Creating implementation for idiom 288 : Check if set contains a value

Idiom

# 288 Check if set contains a value

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

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b = x.find(e) != x.end();

b = x.Contains(e);

var b = x.contains(e);

b = x(e)

b := x[e]

_, b := x[e]

import Data.Set (member)

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);