lpushx #

Prepends the specified value to a list, only if the key already exists and if it holds a list.

lpushx(key, value, [options], [callback]) #

Arguments	Type	Description
`key`	string	Key identifier
`value`	array	Value to add at the beginning of the list
`options`	JSON Object	Optional parameters
`callback`	function	Callback

Options #

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

Return Value #

Returns the MemoryStorage object to allow chaining.

Callback Response #

Returns an integer containing the updated number of items in the list.

Usage #

// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.lpushx('key', 'foo', function (err, count) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.lpushxPromise('key', 'foo')
  .then(count => {
    // resolved once the action has completed
  });

Callback response:

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