How to handle different values of fps, when your video is x1 fps, your sequence x2 fps, TICKS, etc?

I obtain first the items in a collection of project items.

Then get the item in the variable "item", then:

$.writeln("GO!");
if (Item.name=="Sequence 01") {
        var fps = Item.getFootageInterpretation().frameRate; // 
        $.writeln("fps sequ : "+fps); //Will show 2.75404699046078e-8
}
if (Item.name=="myvideoname.mp4") {
        var fps = Item.getFootageInterpretation().frameRate; //
        $.writeln("fps vid : "+fps); //will show 30
}

Ok thank you for the link, seems much more advanced than anything I was writing, will make sure to back to it, as for now I am closing in a project involving in point and out points, without using the FPS. (When that's finished I will try to use what you showed me "elsewhere", to finish everything up.)