How to loop through and turn off ALL layers

[CamCode]

The below finds my layer and shows visible property in the console, when I toggle it there from 'true' or 'false' it changes.

myApp.mapview.map.findLayerById('cool_layer'); 

But when I run the below line, I can toggle my layers on or off individually, but how could I loop through all of them, and turn them all off? I am trying tocreate a 'reset' button.

myApp.mapview.map.findLayerById('cool_layer').visible = true;

javascript arcgis-javascript-api arcgis-javascript-api-4

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[RobertScheitlin__GISP]

Cam,

  Loop through the myApp.mapView.map.layers collection and set the visibility property to false.

          view.map.layers.map(function(lyr){
            console.info(lyr);
            lyr.visible = false;
          });‍‍‍‍

[CamCode]

Thanks Robert, any idea on how to do something similar with all my filtering? How could I programatically find the following in the console, similar to how I am searching my layers: i.e. featureLayerView.filter i.e. FeatureFilter | ArcGIS API for JavaScript 4.14 - I can't find this in the console with the similar syntax i.e. below 

myApp.mapview.map.findLayerById('cool_layer').visible = true;

[RobertScheitlin__GISP · Accepted solution]

Cam,

   Your issue is that the id of the layer is not the layer name normally it is something like:

view.map.findLayerById("Hazards_Uptown_Charlotte_665").visible = false;

If you do not know the exact layer id then you first have to loop through the maps layers and check the layers title or name to see if it matches 'cool layer' and get that layers actual id.