lambda.md

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)