Contains() work not right.

[QJesus]

import { asEnumerable as linq } from 'linq-es2015';

var b = linq("Volvo Black jejtyj 2005").Contains("Volvo");
console.log(b);  // false

[ENikS]

You are comparing string "Volvo Black jejtyj 2005" and "Volvo". These are two different strings. Contains works on arrays of strings.
Instead try ["Volvo", "Black", "jejtyj", "2005"] or you could do split("Volvo Black jejtyj 2005") to separate words into array.

[QJesus]

THX.