JavaScript: Check whether an object contains specified property

JavaScript Object: Exercise-17 with Solution

Check Property Existence

Write a JavaScript function to check whether an object contains a given property.

Sample Solution:

JavaScript Code:

function hasKey(obj, key) {
    return obj != null && hasOwnProperty.call(obj, key);
  }
console.log(hasKey({red: "#FF0000", green: "#00FF00", white: "#FFFFFF"}, "green"));

Output:

true

Flowchart:

Live Demo:

See the Pen javascript-object-exercise-17 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus.

Previous: Write a JavaScript function to get a copy of the object where the keys have become the values and the values the keys.
Next: Write a JavaScript function to check whether a given value is a DOM element.