Zoom is the extent at which the map is displayed.

 

setZoom is a method that sets the map zoom level and does a zoomIn or zoomOut depending on the previous zoom level.

 

 

Example:

map.setZoom(5);

 

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zoomIn and zoomOut are methods that change the zoom (increase or decrease map details) of the map to a zoom level relative to the current map center location.