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Return the value assigned to the given key, if present. If the key is not present, the given yield block will be executed to provide a value to assign to the key, which will also be returned. If the key was already present, the yield block will not be executed.
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Return the value assigned to the given key, if present.
If the key is not present, the given yield block will be executed to provide a value to assign to the key, which will also be returned.
If the key was already present, the yield block will not be executed.