zcard

Returns the number of elements held by a sorted set.

[Redis documentation]


zcard(key, [options], callback)

Arguments Type Description
key string Key identifier
options JSON Object Optional parameters
callback function Callback

Options

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

Callback Response

Returns an integer containing the number of elements in a sorted set.

Usage

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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.zcard('key', function (err, count) {
  // callback called once the action has completed
});

// Using promises (NodeJS only)
kuzzle.memoryStorage.zcardPromise('key')
  .then(count => {
    // resolved once the action has completed
  });

Callback response:

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