es6 map example

newdevices.js

const devices = [
                  {"deviceId":"default","kind":"audioinput","label":"기본값 - 마이크(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"},
                  {"deviceId":"communications","kind":"audioinput","label":"커뮤니케이션 - 마이크(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"},{"deviceId":"80f28f21743218d1430300452892a9272426095e48d4ddd344bef16a57e2d7cb","kind":"audioinput","label":"마이크(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"},{"deviceId":"7fb6410182a2ef6910e68e942dfa9bd4f29350f391599099ed1563ab6e7ac185","kind":"videoinput","label":"Integrated Webcam (0bda:5689)","groupId":"80117ee788b9447605cce20ce90cefec3f387bb62f2df256e2a1559dac667d41"},{"deviceId":"7fb6410182a2ef6910e68e942dfa9bd4f29350f391599099ed1563ab6e7ac185","kind":"videoinput","label":"test Webcam (0bda:5689)","groupId":"80117ee788b9447605cce20ce90cefec3f387bb62f2df256e2a1559dac667d41"},
                  {"deviceId":"default","kind":"audiooutput","label":"기본값 - 스피커 / 헤드폰(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"},
                  {"deviceId":"communications","kind":"audiooutput","label":"커뮤니케이션 - 스피커 / 헤드폰(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"},{"deviceId":"b1ef42095920cde890023686cc26c6792fae6fadcc3e1dc195905097adb3d8a4","kind":"audiooutput","label":"스피커 / 헤드폰(Realtek Audio)","groupId":"2fc5a70356cd629dff0f57c8c5b420757f34b7f60a40184617607bdf125025f8"}
                ];

const newdevices = devices.filter(item => item.kind === 'videoinput').map(item => item.label);
console.log(`dev test devices : ${JSON.stringify(newdevices)}`);
//dev test devices : ["Integrated Webcam (0bda:5689)","test Webcam (0bda:5689)"]

const newdevices = devices.map((item) => {
  const { kind, label } = item;
  if(kind === 'videoinput'){
	  return {label};
  }
});
console.log(`dev test devices : ${JSON.stringify(newdevices)}`);
//dev test devices : [null,null,null,{"label":"Integrated Webcam (0bda:5689)"},{"label":"test Webcam (0bda:5689)"},null,null,null]

const newdevices = devices.filter(item => item.kind === 'videoinput')
.map(item => item.label);
console.log(`dev test devices : ${JSON.stringify(newdevices)}`);
//dev test devices : ["Integrated Webcam (0bda:5689)","test Webcam (0bda:5689)"]