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1. Top results related to what is a built-in function?

   • What is the difference between a language construct and a “built-in” function in PHP ?

     In programming, language constructs and built-in functions are often misinterpreted with one another due to the fact that both have more or less alike behavior. But they differ from each other in the way the PHP interpreter interprets them. Every programming language consists of tokens and structures which the respective language parser can recognize. So whenever a file is parsed, the parser understands their usage and knows well what to do with them without having the need to examine them further. These tokens and structures are known as language construct. They are basically keywords that are a part of the programming language. In other words, they form the syntax of the language. Following are some examples of language constructs:

     -echo()include()require()print()isset()die()-

     Language constructs cannot be added to the PHP framework through any plugins or libraries. They may or may not return any values although most of them don’t. Also, some of them do not need the use of parenthesis.

     Below examples illustrate the use of language construct in PHP: Example 1:

     <?php    print('Monday ');  print 'Tuesday ';  $str = 'Wednesday';  echo $str;   gt...

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   • What is the difference between a language construct and a "built-in" function in PHP?

     Top Answer

     Answered Jul 25, 2009 · 135 votes

     (This is longer than I intended; please bear with me.)

     Most languages are made up of something called a "syntax": the language is comprised of several well-defined keywords, and the complete range of expressions that you can construct in that language is built up from that syntax.

     For example, let's say you have a simple four-function arithmetic "language" that only takes single-digit integers as input and completely ignores order of operations (I told you it was a simple language). That language could be defined by the syntax:

     // The | means "or" and the := represents definition$expression := $number | $expression $operator $expression$number := 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9$operator := + | - | * | /

     From these three rules, you can build any number of single-digit-input arithmetic expressions. You can then write a parser for this syntax that breaks down any valid input into its component types ($expression, $number, or $operator) and deals with the result. For example, the expression 3 + 4 * 5 can be broken down as follows:

     // Parentheses used for ease of explanation; they have no true syntactical meaning$expression = 3 + 4 * 5 = $expression $operator (4 * 5) // Expand into $exp $op $exp = $number $operator $expression // Rewrite: $exp -> $num = $number $operator $expression $operator $expression // Expand again = $number $operator $number $operator $number // Rewrite again

     Now we have a fully parsed syntax, in our defined language, for the original expression. Once we have this, we can go through and write a parser to find the results of all the combinations of $number $operator $number, and spit out a result when we only have one $number left.

     Take note that there are no $expression constructs left in the final parsed version of our original expression. That's because $expression can always be reduced to a combination of other things in our language.

     PHP is much the same: language constructs are recognized as the equivalent of our $number or $operator. They cannot be reduced into other language constructs; instead, they're the base units from which the language is built up. The key difference between functions and language constructs is this: the parser deals directly with language constructs. It simplifies functions into language constructs.

     The reason that language constructs may or may not require parentheses and the reason some have return values while others don't depends entirely on the specific technical details of the PHP parser implementation. I'm not that well-versed in how the parser works, so I can't address these questions specifically, but imagine for a second a language that starts with this:

     Effectively, this language is free to take any expressions it finds and get rid of the surrounding parentheses. PHP (and here I'm employing pure guesswork) may employ something similar for its language constructs: print("Hello") might get reduced down to print "Hello" before it's parsed, or vice-versa (language definitions can add parentheses as well as get rid of them).

     This is the root of why you can't redefine language constructs like echo or print: they're effectively hardcoded into the parser, whereas functions are mapped to a set of language constructs and the parser allows you to change that mapping at compile- or runtime to substitute your own set of language constructs or expressions.

     At the end of the day, the internal difference between constructs and expressions is this: language constructs are understood and dealt with by the parser. Built-in functions, while provided by the language, are mapped and simplified to a set of language constructs before parsing.

     More info:

     • Backus-Naur form, the syntax used to define formal languages (yacc uses this form)

     Edit: Reading through some of the other answers, people make good points. Among them:

     • A language builtin is faster to call than a function. This is true, if only marginally, because the PHP interpreter doesn't need to map that function to its language-builtin equivalents before parsing. On a modern machine, though, the difference is fairly negligible.
     • A language builtin bypasses error-checking. This may or may not be true, depending on the PHP internal implementation for each builtin. It is certainly true that more often than not, functions will have more advanced error-checking and other functionality that builtins don't.
     • Language constructs can't be used as function callbacks. This is true, because a construct is not a function. They're separate entities. When you code a builtin, you're not coding a function that takes arguments - the syntax of the builtin is handled directly by the parser, and is recognized as a builtin, rather than a function. (This may be easier to understand if you consider languages with first-class functions: effectively, you can pass functions around as objects. You can't do that with builtins.)

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     2/5

   • What is the built-in function A of numpy array.A?

     Top Answer

     Answered Dec 01, 2014 · 1 votes

     Ok, so in this way I think its is proparty of scipy matrix returning nparray:

     In [115]: mtx = sp.matrix([1,2,3]) In [116]: mtx.AOut[116]: array([[1, 2, 3]])-

     A is getter/shortcut for getA.

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     3/5

   • What is a built in object in Javascript?

     Top Answer

     Answered Jul 26, 2017 · 2 votes

     That's not actually the difference between those two terms.

     For a programming language to be considered "Object-Oriented", it must support the following four programming concepts:

     • Inheritance
     • Encapsulation
     • Abstraction
     • Polymorphism

     There are many languages that support these "four pillars of OOP" (Java, C/C++, C#, JavaScript, etc.).

     Some languages, however, don't. A famous example of that would be what we now call "Classic VB" (Visual Basic prior to the introduction of .NET). That language could simulate inheritance, but there was not actual mechanism built into the language for it, so while "Classic VB" had native objects, it is an "object-based", "not object-oriented", programming language because it does support the concept of objects, but not all the aspects that a true OOP language requires.

     It should be noted that many OOP languages are built on the concept of "classes" as the mechanism to generate objects from. And, while this is a very popular way to architect objects, it is not a requirement for a language to be OO. JavaScript does not have classes (despite having a class keyword), it has "prototypes" and they are the architecture upon which objects are implemented.

     Your question about "native" objects is not related to any of this. You most likely read that native objects were related to all of this at this Wikipedia page, but that page had many errors on it and I have edited that page to be more accurate. Whether or not a language has "built-in" or "native" objects is not at all related to whether it is object-oriented or object-based, since both types of languages are object-centric (my own term). For example, VB 6 was an object-based language, but supported a wide array of native objects and VB .NET (its successor) is object-oriented and also supports a vast amount of native objects.

     I will tell you that a "native" object is simply one that is built right into the language specification itself and the runtime environment has access to it internally. In JavaScript, some examples would be String, Date, Array, RegEx, Math, Object, etc. Note that while, in your question, you mentioned window, window is not a native JavaScript object, that object is supplied by the browser that hosts the JavaScript runtime. If you were running your JavaScript in Node.js, window would not be available because it is not native to JavaScript and Node doesn't provide such an object to the runtime.

     Here are some good links to look at to understand OOP concepts and how they work in JavaScript:

     • https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects
     • https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Object-oriented_JS

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     4/5

   • Is list a built in function or a class in python 3

     Top Answer

     Answered Apr 07, 2020 · 4 votes

     list is a built-in class in Python. However, classes are callable just like functions, and when called, classes instantiate and return objects, so you can pass a class as an argument where a function (or a callable to be precise) is expected.

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     5/5

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2. docs.python.org · 3 · libraryBuilt-in Functions — Python 3.12.6 documentation

   docs.python.org · 3 · library

   

   2 days ago · Built-in Functions¶ The Python interpreter has a number of functions and types built into it that are always available. They are listed here in alphabetical order.

   • Introduction

     Regardless of the order in which you read the sections of...

   • Built-in Constants

     A small number of constants live in the built-in namespace....

   • Python 3.7.17 Documentation

     We would like to show you a description here but the site...

   • Funciones Built-In

     filter (function, iterable) ¶ Construye un iterador a partir...

   • Fonctions Natives

     compile (source, filename, mode, flags = 0, dont_inherit =...

3. People also ask

   What is a built in function in JavaScript?

   • What is built in function in JavaScript? A built-in function in JavaScript is a function that’s already available for use without needing any extra code. These functions are a part of JavaScript itself and are designed to do common tasks like working with text, doing math calculations, and handling lists of data.

   JavaScript built-in functions: A cheat sheet for Beginners

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   What are Python built-in functions?

   • Here is a comprehensive list of Python built-in functions: returns an octal representation of an integer in a string format. 1. What are built-in functions in Python? Built-in functions in Python are pre-defined functions provided by the Python language that can be used to perform common tasks. 2. How do I use built-in functions?

   Python Built-in Functions - GeeksforGeeks

   www.geeksforgeeks.org/python-built-in-functions/

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   What is a built-in function?

   • Built-in functions solve a wide range of common programming problems such as performing math operations, working with common data types, processing iterables of data, handling input and output, working with scopes, and more. In this tutorial, you’ve learned:

   Python's Built-in Functions: A Complete Exploration

   realpython.com/python-built-in-functions/

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   What is the difference between a function and a built-in function?

   • Functions are the set of lines of code that work and behave together under a name. Built-in functions are the ones whose functionality is predefined. These get stored in the interpreter and come into action when they are called. These can be accessed from any part of the program. The Python 3.6 version has 69 built-in functions and these are:

   Built-in Functions in Python - Python Geeks

   pythongeeks.org/built-in-functions-in-python/

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4. www.w3schools.com · python · python_ref_functionsPython Built in Functions - W3Schools

   www.w3schools.com · python · python_ref_functions

   

   Python has a set of built-in functions. Function. Description. abs () Returns the absolute value of a number. all () Returns True if all items in an iterable object are true. any () Returns True if any item in an iterable object is true.

   Function	Description
   abs ()	Returns the absolute value of a number
   all ()	Returns True if all items in an iterable ...
   any ()	Returns True if any item in an iterable ...
   ascii ()	Returns a readable version of an object.

   See full list on w3schools.com

5. Videos

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6. www.geeksforgeeks.org · python-built-in-functionsPython Built-in Functions - GeeksforGeeks

   www.geeksforgeeks.org · python-built-in-functions

   

   Jul 24, 2023 · Explore the world of Python's built-in functions, including abs (), all (), bin (), bool (), sum (), bytes (), callable (), and many more. Learn their functionalities and see examples of how these powerful tools can enhance your Python programming experience.

7. realpython.com · python-built-in-functionsPython's Built-in Functions: A Complete Exploration

   realpython.com · python-built-in-functions

   

   Jul 1, 2024 · In this tutorial, you'll learn the basics of working with Python's numerous built-in functions. You'll explore how to use these predefined functions to perform common tasks and operations, such as mathematical calculations, data type conversions, and string manipulations.

8. itsourcecode.com · javascript-tutorial · javascriptJavaScript built-in functions: A cheat sheet for Beginners

   itsourcecode.com · javascript-tutorial · javascript

   

   Jul 19, 2023 · A built-in function in JavaScript is a function that’s already available for use without needing any extra code. These functions are a part of JavaScript itself and are designed to do common tasks like working with text, doing math calculations, and handling lists of data.

9. www.programiz.com · methods · built-inPython Built-in Functions - Programiz

   www.programiz.com · methods · built-in

   

   Python has several functions that are readily available for use. These functions are called built-in functions. On this reference page, you will find all the built-in functions in Python.

10. pythongeeks.org · built-in-functions-in-pythonBuilt-in Functions in Python - Python Geeks

    pythongeeks.org · built-in-functions-in-python

    

    Learn about various built-in functions in Python with syntax and examples. It covers functions like abs(), all(), any(), ascii(), bin() etc.