Lambda, Filter, Map, and Sorted

8.1. Lambda, Filter, Map, and Sorted#

8.1.1. 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

8.1.2. 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)

8.1.3. Map#

  • Uses function to transform the values in a sequence

map(function, sequence)

8.1.4. Sorted#

  • Uses function to sort values

sorted(sequence, key=function)
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