colors = [{:primary, "red"}, {:secondary, "green"}]
# [primary: "red", secondary: "green"]
colors[:primary]
# "red"     # elixir scroll through all the element

colors = [primary: "red", secondary: "blue"] # this is also same semantic with different synthetic

colors = %{ primary: "red", primary: "blue" } # in case of map, it overwrites.
# %{primary: "blue"}

colors = [primary: "red", primary: "blue"]
# [primary: "red", primary: "red"]  # This kind of non-overwriting feature helps in DB (ecto)

query = User.find_where([where: user.age> 10, where: user.subscribed ==true])

query = User.find_where(where: user.age> 10, where: user.subscribed ==true) 
# this is also same. it looks like feeding two args, but it's same.

query = User.find_where where: user.age> 10, where: user.subscribed ==true 
# this is also same. it looks like feeding two args, but it's same.