exists #

Checks if the specified keys exist in the database.

[Redis documentation]

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exists(keys, [options], callback) #

Arguments	Type	Description
keys	array	List of keys to check for existence
options	JSON Object	Optional parameters
callback	function	Callback

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Options #

Option	Type	Description	Default
queuable	boolean	Make this request queuable or not	true

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Callback Response #

Returns an integer containing the number of existing keys amongst the provided list.

Usage #

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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.exists(['key1', 'key2', '...'], function (err, count) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.existsPromise(['key1', 'key2', '...'])
  .then(count => {
    // resolved once the action has completed
  });

Callback response:

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