to have an item satisfying

• <Set> to have an item [exhaustively] satisfying <assertion>
• <Set> to have an item [exhaustively] satisfying <any>

Asserts that at least one item contained in a Set satisfies a given value, function or other assertion.

expect(new Set([1, 2, 3]), 'to have an item satisfying', 4);

expected new Set([ 1, 2, 3 ]) to have an item satisfying 4
 
new Set([
  
1, 
//
 
should equal 4
  
2, 
//
 
should equal 4
  
3 
//
 
should equal 4
])

In order to check a property holds for at least one item, an assertion can be passed as the argument – in this example we assert that one of the items in the set is a number:

expect(
  new Set(['a', false, []]),
  'to have an item satisfying',
  'to be a number'
);

expected new Set([ 'a', false, [] ]) to have an item satisfying to be a number
 
new Set([
  
'a', 
//
 
should be a number
  
false, 
//
 
should be a number
  
[] 
//
 
should be a number
])