Laravel: Call to undefined method Illuminate\Database\Eloquent\Collection::where()...

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Global variables undefined when referencing them via window object...

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undefined method `each' for nil:NilClass... why?...

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(Lazy) Haskell undefined/bottom in OCaml...

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Check if object exists in JavaScript...

Call a function only if a value is neither null nor undefined...

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eclipse fails to display collection elements in debug mode with error message "The method toArr...

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undefined body in PUT request...

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