firstOrDefault

Tries to return the first element of a sequence.

JavaScript

// 1
Enumerable.create(1, 2, 3)
          .firstOrDefault('MK');

// 22
Enumerable.create(11, 22, 33)
          .firstOrDefault(x > 11', 'MK');

// "TM"
Enumerable.create(111, 222, 333)
          .firstOrDefault('x => x > 333', 'TM');

// "YS"
Enumerable.create()
          .firstOrDefault('YS');