The importance of adding ".$" to an AngularJS filter object

I have been exploring a section of code related to filtering in AngularJS from the documentation website. (cf. http://docs.angularjs.org/api/ng.filter:filter)

Specifically, I am curious about the use of .$ appended to the object search, as shown in the following lines:

24.    Any: <input ng-model="search.$"> <br>
25.    Name only <input ng-model="search.name"><br>
26.    Phone only <input ng-model="search.phone"><br>
       ...
30.    <tr ng-repeat="friendObj in friends | filter:search:strict">

While experimenting with a JSFiddle, I tried removing the .$ and found that the filtering still worked when text was inputted. This made me wonder why the .$ is needed at all if the search filter functions without it.

As a newcomer to AngularJS (and JavaScript in general), I am enjoying delving into this learning process. Any insights or guidance on this matter would be greatly appreciated.

javascriptangularjs

Answer №1

Upon reviewing the filter page, a specific line caught my attention:

This is essentially the same as performing a simple substring match with a string, as explained earlier.

In essence, what this means is that when you simply use ng-model="search", you are conducting a string search by default, which will search all string items within the array/object. On the other hand, using search.$ indicates that you intend to search each item within an object. As stated in the passage, these two methods yield equal results.

While utilizing just search achieves the same outcome with less code, I argue that using .$ provides a clearer explanation of the filter's purpose in the example.

Answer №2

When using all properties of objects for searching, it will search through all properties for a match. On the other hand, if you use search.name, it will only look for a match in the name property. However, with search.$, it searches through all properties.

If you use a special property name $ (as in {$:"text"}), it allows for a match against any property of the object. This is similar to a simple substring match using a string as mentioned above.

Source: http://docs.angularjs.org/api/ng.filter:filter

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