Stuck to understand angular array search - angularjs

Question

see the code below.
i am new in angular. just do not understand this line
{{ (fields | filter : {fieldName:"houseNum"} : true)[0].fieldLabel}}
what is the meaning of true in bracket if we specify false like ({{ (fields | filter : {fieldName:"houseNum"} : false)[0].fieldLabel}}) then what will happen ?
Full code
<div ng-app="app" ng-controller="ctrl">
{{ (fields | filter : {fieldName:"houseNum"} : true)[0].fieldLabel}}
</div>
angular.module('app', []).controller('ctrl', function($scope) {
$scope.fields = [{
fieldName: 'houseNum',
fieldLabel: 'House Number',
disabled: false
}, {
fieldName: 'street',
fieldLabel: 'Street',
disabled: false
}, {
fieldName: 'city',
fieldLabel: 'City',
disabled: true
}, {
fieldName: 'state',
fieldLabel: 'State',
disabled: true
}, ]
})
sample taken from https://jsfiddle.net/tridip/q2r3cogj/

Answer 1

According to the AngularJS documentation:
Comparator which is used in determining if values retrieved using expression
(when it is not a function) should be considered a match based on the the
expected value (from the filter expression) and actual value (from the object
in the array).
Can be one of:
function(actual, expected): The function will be given the object value and
the predicate value to compare and should return true if both values should be
considered equal.
true: A shorthand for function(actual, expected) { return
angular.equals(actual, expected)}. This is essentially strict comparison of
expected and actual.
false: A short hand for a function which will look for a substring match in a
case insensitive way. Primitive values are converted to strings. Objects are
not compared against primitives, unless they have a custom toString method
(e.g. Date objects).
Defaults to false.
So setting it to true requires an exact match for the item to be shown. A false setting will allow for partial matches, case insensitive matches, etc.