expression (Mapbox)

An expression is a formula for calculating a value in a layerA layer is a reference to a collection of geographic data that is used to access and display data. The data for layers are typically provided by the basemap layer service and data services.Learn more, using the Mapbox GL expression syntax. Expressions can retrieve property values, perform arithmetic calculations, respond to the current zoom levelZoom level is a value that sets the scale for a map view or a scene view.Learn more, or choose between different options depending on a value. Expressions are expressed as an array, where the first element defines the type of expression. For example, ['get', 'name'] retrieves the name attribute from a featureA feature is a single record, also known as a row, that represents a real-world entity. It typically contains a geometry (point, multipoint, polyline, or polygon) and attributes but it can also contain just attributes.Learn more.