JavaScript offers powerful tools for working with arrays – map, filter, and reduce. In this concise guide, we’ll uncover the magic of these functions and how they can level up your data manipulation game.
Tag: map
Working with dictionaries in Python is a common task for many programmers, as it allows them to store and manipulate data in a key-value format. However, sometimes we may need to access a key in a dictionary that does not exist, and we want to provide a default value in such cases. The get() method in Python provides a simple and elegant solution to this problem.
The get() method is used to retrieve the value of a specified key in a dictionary. It takes two parameters: the key to look for and a default value to return if the key is not found in the dictionary. If the key is present in the dictionary, get() returns the corresponding value. Otherwise, it returns the default value specified.
Let’s look at the following code snippet:
dictionary = {'first_element': 1, 'second_element': 2}
print(dictionary.get('third_element', 3)) # 3
In this code, we have a dictionary with two key-value pairs. We then use the get() method to retrieve the value associated with the key 'third_element'. Since this key is not present in the dictionary, the method returns the default value of 3.
You have probably had the chance to iterate through a list of elements in one way or another, or through elements of a set, or a dictionary. We can go through a list, a set, or a dictionary and access their elements because they are iterable objects.
An iterator is an object that contains a countable number of objects. This means that you can iterate through elements that an iterator contains.
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Dictionaries also known as maps are data structures that are used a lot in different scenarios. The process of getting an element from a dictionary can be done using an element that is not part of the dictionary which results in an error.
For example, let us take this scenario where we have a dictionary that has an element with the key name and another one with the element surname. If we want to access it using another element, such as age, we are going to see an error like the following:
my_dictonary = {"name": "Name", "surname": "Surname"}
print(my_dictonary["age"])
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