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What Are the Different ways of Filtering Firebase data?

Limit to First and Last -
·       limitToFirst  - This method is used to returning the specific number of items starting from the first one.
·       limitToLast  - This method is used to returning the specific number of items starting from the last one.

 Example -
var fPlayerRef = firebase.database().ref("users/").limitToFirst(1);
var lstPlayerRef = firebase.database().ref('users/').limitToLast(1);

fPlayerRef.on("value", function(data) {
        console.log(data.val());
        }, function (error) {
    console.log("Error: " + error.code);
});

lstPlayerRef.on("value", function(data) {
         console.log(data.val());
    }, function (error) {
    console.log("Error: " + error.code);
});

Stayed Informed - Firebase Tutorial for Android and IOS

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