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what is a pure function

By Pink PersonPink Person on Nov 19, 2020
Referential transparency: 
	always gives the same return value for the same arguments. 
	the function cannot depend on any mutable state.
Side-effect free: 
	cannot cause any side effects. 
      includin I/O (e.g., writing to the console or a log file), 
      modifying a mutable object, 
      reassigning a variable
      writing to the console
      
NOT pure functions:
  console.log
  element.addEventListener
  Math.random
  Date.now
  $.ajax 

const o4 = Object.freeze({ foo: 'cant change me' }); //The object is immutable and the variable cannot be reassigned. This is what we want!!!!!!!!

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