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Higher Order Functions - Filter

Objectives

  • Review Higher Order Functions
  • Review Map Method
  • Explain what the Filter method does
  • Solve Problems Using Filter

Higher Order Function

##takes a function as an input ###OR

returns a function as output

Map

Map Review

  • An array method
  • Takes a function as an input
  • Applies that function to every item in the array
  • Returns a NEW array that contains transformed data

Filter

Filter

  • An array method
  • Takes a function as an input (the function should return a boolean)
  • Tests each item in the array using the function
  • Returns a NEW array that contains all items that pass the test

Let's Try It