keys < Object < JavaScript

The Object keys() static method returns the object's own enumerable property names ("keys") as an array.

    
    const flight = {
      start: "Detroit",
      end: "Miami",
      airline: "Delta",
      jet: 767
    };

    const flightObjKeys = Object.keys(flight);

    console.log(flightObjKeys);
    // ["start", "end", "airline", "jet"]


    // related example
    // given object value, get key
    function getKeyByValue(object, value) {
      return Object.keys(object).find(key => object[key] === value);
    }

    console.log(getKeyByValue(flight,"Delta"));
    // airline