How deeply does Clojure: The Essential Reference cover all?

Defines inputs, truthiness, outputs, accepted collections, exceptions, logical relatives, and empty-collection behavior.

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As explained in Clojure: The Essential Reference

every? is a Clojure function that tests whether a predicate returns truthy for every element of a collection.

every? tests whether a predicate returns truthy for every element of a collection, producing a boolean answer for an all-items question. section 8.1.5

Use it with a one-argument predicate and any collection supported by seq.

Treat any non-nil, non-false predicate result as truthy; every? itself returns only true or false. section 8.1.5
Expect true for an empty collection, because no element violates the predicate. section 8.1.5
Use related functions for complementary questions: not-every?, some, and not-any?. section 8.1.5

Checking cards

(defn bingo? [card] (every? drawn card)) (map bingo? cards) ;; (false false true) Here, every? checks whether each number on a card appears in drawn.

How Clojure: The Essential Reference covers it

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Also explained in

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Related concepts

anycontrasts with · An any or some operation returns a Boolean indicating whether at least one element in a collection satisfies a predicate or, when none is supplied, is truthy.
Monoproduces · Mono is a Project Reactor publisher type representing an asynchronous computation that emits zero or one item.
Fluxuses · Flux is a Project Reactor publisher type representing an asynchronous sequence that emits zero or more ordered values.
not-every?equivalent to · not-every? is a Clojure function that returns the logical negation of every? for a predicate and collection.
logical AND operatorequivalent to · A logical AND operator is a Boolean conjunction that produces true exactly when all operands have true truth values.
higher-order functionkind of · A higher-order function is a function that accepts functions as arguments, returns functions as results, or both.

This explainer was generated by Manning's knowledge graph from the text of Clojure: The Essential Reference. The section links point to the parts of the book it draws on.