name

Summary

Details

Returns true if the value of x equals the value of y, false otherwise.

= is a value comparison, not an identity comparison.

All collections can be tested for value, regardless of "depth".

(= 1)
;;=> true

(= 1 1)
;;=> true

(= 1 2)
;;=> false

(= 1 1 1)
;;=> true

(= 1 1 2)
;;=> false

Sequences are considered equal in value if they have the same elements:

(= '(1 2) [1 2])
;;=> true

But you cannot compare JavaScript arrays until you convert them to sequences:

(def a #js [1 2])
(def b #js [1 2])
(= a b)
;;=> false

(= (seq a) (seq b))
;;=> true

It is natural to compare deeply nested collections since value equality checks are cheap in ClojureScript:

(def a {:foo {:bar "baz"}})
(def b {:foo {:bar "baz"}})
(= a b)
;;=> true

(= [a b] [a b])
;=> true

JavaScript objects cannot be compared in this way until they are converted to ClojureScript collections:

(def a #js {:foo #js {:bar "baz"}})
(def b #js {:foo #js {:bar "baz"}})
(= a b)
;;=> false

(= (js->clj a)
   (js->clj b))
;;=> true