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id compare mainCompare focusOn video learnBackAbout lesson title layout class preview_image preview_image_alt
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Map vs Filter - Project function vs Predicate
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Filter a stream

Project vs Predicate

In the video example, ▬ isEven accepts a number as an argument:

  • If it is an even number, it returns ✔ true
  • Otherwise, it returns ✘ false

It is used as:

  • a project function on ❚ map
  • a predicate function on ❚ filter

A predicate returns ✔ true or ✘ false.

Learn more about project and predicate.