undefined?

function/macro

since v0.0-927

Edit

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Source docstring:

Returns true if x identical to the JavaScript undefined value.

(defn ^boolean undefined?
  [x]
  (cljs.core/undefined? x))

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(core/defmacro undefined?
  [x]
  (bool-expr (core/list 'js* "(void 0 === ~{})" x)))

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