Identify the falsy values from the listed options.

Prepare for the Salesforce JavaScript Developer I Certification Exam. Utilize interactive quizzes, flashcards, and detailed explanations for each question. Boost your confidence and ace your exam effortlessly!

The identification of falsy values in JavaScript is based on specific rules regarding how different types of data evaluate in a Boolean context.

In JavaScript, falsy values include:

  • 0: The number zero is a falsy value.

  • '': An empty string is also a falsy value.

  • undefined: This value indicates that a variable has been declared but has not yet been assigned a value, and it is considered falsy.

The combination of these three values—0, '', and undefined—constitutes the complete set of falsy values in the first choice.

The second option includes new Number(0) and new Boolean(false), which are wrapped objects. While their primitive values might evaluate to false in a Boolean context, the objects themselves are truthy. This fundamentally alters the evaluation since object instances are always truthy regardless of their internal values.

The third option includes new Boolean(false), which again is an object and therefore does not count as falsy even though it represents false.

The last option suggests that all listed sets are falsy, which is incorrect because not all object types qualify as falsy in JavaScript.

Thus, the first choice accurately contains only the values that are universally recognized

Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy