collect.js

contains()

The contains method determines whether the collection contains a given item:

const collection = collect({
  name: "Steven Gerrard",
  number: 8
});

collection.contains("name");
//=> true

collection.contains("age");
//=> false

collection.contains("Steven Gerrard");
//=> true

You may also work with arrays

const collection = collect([1, 2, 3]);

collection.contains(3);
//=> true

You may also pass a key / value pair to the contains method, which will determine if the given pair exists in the collection:

const collection = collect({
  name: "Steven Gerrard",
  number: 8
});

collection.contains("name", "Steve Jobs");
//=> false

Finally, you may also pass a callback to the contains method to perform your own truth test:

const collection = collect([1, 2, 3, 4, 5]);

collection.contains((value, key) => value > 5);

//=> false

View source on GitHub

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