Chapter 9: Problem 12

What does the keys method return?

Short Answer

Expert verified

Answer: The keys method is a built-in function in various programming languages, such as Python, JavaScript, and Ruby, used on dictionaries (also known as hashes, maps, or associative arrays). This method returns a list of all the keys present in the dictionary. For example, given a dictionary of a student's grades in different subjects, using the keys method will provide a list of subjects (keys) in the dictionary.

Step by step solution

Definition of Keys Method

The keys method is a built-in function in various programming languages, like Python, JavaScript, and Ruby, which is used on dictionaries (also known as hashes, maps, or associative arrays). The method returns a list of all the keys present in the dictionary.

Example Usage

Let's consider a Python dictionary representing a student's grades in different subjects: grades = { "Math": 85, "English": 90, "Science": 95 } To obtain a list of the subjects (keys) in this dictionary, we use the keys method as follows: subjects = grades.keys() Now, the variable "subjects" will have the following list of keys: ["Math", "English", "Science"] From this example, we see that the keys method returns a list of the keys present in the dictionary, enabling us to access all the key values as needed.

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What does the keys method return?

Short Answer

Step by step solution

Definition of Keys Method

Example Usage

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