Lambda, Filter, Map, and Sorted

Lambda

lambda a function without a name;

• anonymous functions

• one line only

• single expression only

• stored in a variable

• When do you use it?

  • Pass a function into another function as a parameter

• lambda variables (comma separated): expression

• lambda functions are used with other functions. Usually with map, filter, sort

Filter

• Uses function to test the truthiness of each value in the sequence and returns a filtered list.

• function must return True or False

filter(function, sequence)

Map

• Uses function to transform the values in a sequence

map(function, sequence)

Sorted

• Uses function to sort values

sorted(sequence, key=function)