RTCStatsReport: keys() method

Syntax

keys()

Parameters

None.

Return value

A new iterable iterator object.

Examples

This example shows how to iterate through a RTCStatsReport using the iterator returned by keys().

Given a variable myPeerConnection, which is an instance of RTCPeerConnection, the code calls getStats() with await to wait for the statistics report. It then uses a for...of loop, with the iterator returned by keys(), to iterate through the IDs. Each ID is used to get the corresponding statistics dictionary. The properties of statistics objects with the type of outbound-rtp are logged to the console (other objects are discarded).

const stats = await myPeerConnection.getStats();

for (const id of stats.keys()) {
  // Get dictionary associated with key (id)
  const stat = stats.get(id);
  if (stat.type !== "outbound-rtp") continue;
  Object.keys(stat).forEach((statName) => {
    console.log(`${statName}: ${report[statName]}`);
  });
}

Note that this examples is somewhat contrived. You could more easily iterate with entries() or values() and not have to map the ID to a value. You can even iterate the RTCStatsReport itself, as it has the [Symbol.iterator]() method!

Specifications

Browser compatibility

See also

• Map.prototype.keys()
• RTCStatsReport.values()
• RTCStatsReport.entries()