Ability to style each feature in a GeoJson layer

[aravind-lattis]

Consider I am having a GeoJson Layer with 5 features, I am able to set a style to the total layer only, I need to control the style for each feature of that layer dynamically not by a GeoJson Property while adding the layer, should be programmatic(for example change the colour of the 1st feature of the GeoJson Layer in a click event).

[lucaswoj]

There are two ways to go about this:

1. Create a layer per feature. Use filters to only draw one feature per layer. Style each layer independently.

2. Use data-driven styling to style features based on their properties https://www.mapbox.com/blog/data-driven-styling. This feature is still rolling out and only supported for certain style properties. See the style spec for compatibility information.

[jfirebaugh]

for example change the colour of the 1st feature of the GeoJson Layer in a click event

See https://www.mapbox.com/mapbox-gl-js/example/hover-styles/ for a way to accomplish this specific goal.

Other plans we have in the pipeline for addressing these types of use cases include #200 and #2874.

Closing here since we have existing issues that cover this ground.