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  2. Fold (higher-order function) - Wikipedia

    en.wikipedia.org/wiki/Fold_(higher-order_function)

    Folds can be regarded as consistently replacing the structural components of a data structure with functions and values. Lists, for example, are built up in many functional languages from two primitives: any list is either an empty list, commonly called nil ([]), or is constructed by prefixing an element in front of another list, creating what is called a cons node ( Cons(X1,Cons(X2,Cons ...

  3. Concatenation - Wikipedia

    en.wikipedia.org/wiki/Concatenation

    In many programming languages, string concatenation is a binary infix operator, and in some it is written without an operator. This is implemented in different ways: Overloading the plus sign + Example from C#: "Hello, " + "World" has the value "Hello, World". Dedicated operator, such as . in PHP, & in Visual Basic [1] and || in SQL.

  4. List comprehension - Wikipedia

    en.wikipedia.org/wiki/List_comprehension

    Here, the list [0..] represents , x^2>3 represents the predicate, and 2*x represents the output expression.. List comprehensions give results in a defined order (unlike the members of sets); and list comprehensions may generate the members of a list in order, rather than produce the entirety of the list thus allowing, for example, the previous Haskell definition of the members of an infinite list.

  5. Linked list - Wikipedia

    en.wikipedia.org/wiki/Linked_list

    One may also use a sentinel node at the end of the list, with an appropriate data field, to eliminate some end-of-list tests. For example, when scanning the list looking for a node with a given value x, setting the sentinel's data field to x makes it unnecessary to test for end-of-list inside the loop. Another example is the merging two sorted ...

  6. Generator (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Generator_(computer...

    In Python, a generator can be thought of as an iterator that contains a frozen stack frame. Whenever next() is called on the iterator, Python resumes the frozen frame, which executes normally until the next yield statement is reached. The generator's frame is then frozen again, and the yielded value is returned to the caller.

  7. 6 Side Gigs To Avoid in 2025 - AOL

    www.aol.com/finance/6-side-gigs-avoid-2025...

    Here’s an example. A popular online survey site , Swagbucks, pays its members anywhere from $1 to $5 daily. Some offers do pay $50 to $250, but these tend to be more intensive and time-consuming.

  8. Why the stock market crushed expectations in 2024 - AOL

    www.aol.com/why-stock-market-crushed...

    The stunning rally in US stocks this year caught Wall Street's top forecasters off guard, with most analysts far less upbeat heading into 2024.

  9. What is the birthstone for December? Hint: There's actually ...

    www.aol.com/birthstone-december-hint-theres...

    A popular example is King Tut's funeral mask which is adorned with turquoise, the Geological Institute of America reports. The stone spans from blue to green in color.