How do I get the first element of a list?

Approach:

1. Get the ArrayList with elements.
2. Get the first element of ArrayList with use of get(index) method by passing index = 0.
3. Get the last element of ArrayList with use of get(index) method by passing index = size – 1.

How do I get the first element of a list in Python?

The first element is accessed by using blank value before the first colon and the last element is accessed by specifying the len() with -1 as the input.

How do you extract the first element of a list in R?

To extract only first element from a list, we can use sapply function and access the first element with double square brackets. For example, if we have a list called LIST that contains 5 elements each containing 20 elements then the first sub-element can be extracted by using the command sapply(LIST,”[[“,1).

How do you remove the first entry from a list in Python?

Use list. pop() to remove the first element from a list. Call list. pop(index) on a list with index as 0 to remove and return the first element.

How do you randomize the order of items in a list?

To randomly shuffle elements of lists ( list ), strings ( str ) and tuples ( tuple ) in Python, use the random module. random provides shuffle() that shuffles the original list in place, and sample() that returns a new list that is randomly shuffled. sample() can also be used for strings and tuples.

How do you access the elements of a list?

Accessing elements from the List. In order to access the list items refer to the index number. Use the index operator [ ] to access an item in a list. The index must be an integer.

How do I get a list of data in a list in Python?

Python List of Lists

1. Retrieve the first list element ( row_1 ) using data_set[0] .
2. Retrieve the last list element ( row_5 ) using data_set[-1] .
3. Retrieve the first two list elements ( row_1 and row_2 ) by performing list slicing using data_set[:2] .

How do you sort a list?

We can use the following methods to sort the list:

1. Using stream. sorted() method.
2. Using Comparator. reverseOrder() method.
3. Using Comparator. naturalOrder() method.
4. Using Collections. reverseOrder() method.
5. Using Collections. sort() method.

What is the correct command to shuffle the following list?