Some & Every - Functional JavaScript - Supercharged

Key Takeaways

[Music] last time we talked about the filter method on erase that allows you to throw away array elements that don't fulfill a predicate sometimes however you're not really interested in throwing stuff away but rather in whether there will be anything left at all after filtering and for this very reason there's some and every let's say we have a form with a couple of mandatory input fields before submitting the form we want to make sure that every mandatory field has a value in it and surprise we can use every here every only returns true when every element in the array fulfills the given predicate its counterpart is some a method that returns true if there's at least one element in the array that fulfills the predicate let's say you have a couple of functions that validate address formats from different countries in the scenario all you are really interested in is if any of these evaluators say that the address given by the user is valid and not necessarily which of these validators is saying so so keep every and some in mind whenever you use these words to describe a condition in case you missed it we already had one episode on functional array methods in JavaScript last time so if you missed that one you should watch it over here and if you want to know when the next episode comes out you should subscribe to this channel you can get notifications