Does an AngularJS watch fire upon object initialization

Question

I'm currently working on an AngularJS app

I have an object which contains some boolean flags. I created a watch for one of such bool.

Does the watch fire upon object creation? Can the watch fire at random time even the boolean flag hasn't changed?

Answer 1

So we have (I'm working with Gianluca):

scope.$watch("chartData.selectedIndicator", function() {
    if (chartData.selectedIndicator !== -1){
        highlightMessageIndicator(chartData.selectedIndicator);
    }
}, true);

...despite not having updated chartData.selectedIndicator, this watch is still being hit and I am wondering if it is because within our chartData factory we are initialising selectedIndicator and this is why the watch is being hit?

angular
    .module("app")
    .factory("chartData", [..., chartData]);

function chartData(...) {
    var chartData = {
        selectedIndicator   : -1,

I wonder if this would potentially be a case of just checking for newValue !== oldValue as suggested then?