Mastering Immutable.js

Logical and/or conditions

You've seen how we can use maps to execute behavior based on a single value. Where this approach falls apart is when you get into more involved logic and/or conditions. However, you can still use Immutable.js collections to check declaratively for these types of conditions. For example, let's implement a function that will help us look for AND/OR conditions:

const some = (...predicates) => {  const predicateSeq = Seq(predicates);  return (...args) => predicateSeq.some(p => p(...args));};const every = (...predicates) => {  const predicateSeq = Seq(predicates);  return (...args) => predicateSeq.every(p => p(...args));};

The some() function is used to evaluate predicate functions in a logical OR fashion while the every() ...