The source array.

The predicate to be used for selecting items from array.

Can be one of:

• string: The string is evaluated as an expression and the resulting value is used for substring match against the contents of the array. All strings or objects with string properties in array that contain this string will be returned. The predicate can be negated by prefixing the string with !.

• Object: A pattern object can be used to filter specific properties on objects contained by array. For example {name:"M", phone:"1"} predicate will return an array of items which have property name containing "M" and property phone containing "1". A special property name $ can be used (as in {$:"text"}) to accept a match against any property of the object. That‘s equivalent to the simple substring match with a string as described above.

• function(value): A predicate function can be used to write arbitrary filters. The function is called for each element of array. The final result is an array of those elements that the predicate returned true for.

Comparator which is used in determining if the expected value (from the filter expression) and actual value (from the object in the array) should be considered a match.

Can be one of:

1. -`function(actual, expected)`:
2. Thefunction will be given the object value and the predicate value to compare and
3. should returntrueif the item should be included in filtered result.
4.  
5. -`true`: A shorthand for`function(actual, expected) { return angular.equals(expected, actual)}`.
6. thisis essentially strict comparison of expected and actual.
7.  
8. -`false|undefined`: A short hand for a function which will look for a substring match incase
9. insensitive way.