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Question 131 of 521

Part 3: DOM, Event Flow, Timers & Browser APIs (104 - 173)

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JavaScript Internals (521 Qs)•Part 3: DOM, Event Flow, Timers & Browser APIs (104 - 173)

How do you loop through or enumerate javascript object

You can use the for-in loop to loop through javascript object. You can also make sure that the key you get is an actual property of an object, and doesn't come from the prototype using hasOwnProperty method.

javascript
  var object = {
    k1: "value1",
    k2: "value2",
    k3: "value3",
  };

  for (var key in object) {
    if (object.hasOwnProperty(key)) {
      console.log(key + " -> " + object[key]); // k1 -> value1 ...
    }
  }
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