OptionsPattern

OptionsPattern[] is a pattern object that represents a collection of options given as rules, where the values of the options can be accessed using OptionValue.

• OptionsPattern[f] takes default option values from Options[f].
• OptionsPattern[{opt1 -> val1, opt2 -> val2, ...}] uses an explicit list of default option values.

Examples

f[x_, opts : OptionsPattern[{a -> 1}]] := {x, OptionValue[a]}
f[5, a -> 10]

Please visit the official Wolfram Language Reference for more details.