check if given attribute exists

Parameters

attr? name :string :literal

Returns

Examples

copy
greet: function [x][
    if? not? attr? 'later [
        print ["Hello" x "!"]
    ]
    else [
        print [x "I'm afraid I'll greet you later!"]
    ]
]

greet.later "John"

; John I'm afraid I'll greet you later!

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