There are no syntactic differences between C and C++ with regard to const keyword, besides a rather obscure one: in C (since C99) you can declare function parameters as void foo(int a[const]); which is equivalent to void foo(int *const a); declaration. C++ does not support such syntax. Semantic differences exist as well. As @Ben Voigt … Read more
generic case using Array.map, requires javascript 1.6 (that means, works on every browser but IE < 9) or with an object augmenting framework like MooTools works on every browser: var list_of_names = document.getElementsByTagName(‘input’).map( function(element) { return element.getAttribute(‘name’); } ); If dealing with an iterable that doesn’t provide map (such as generators), spread syntax can be … Read more
In order of appearance, the languages are sed, awk, perl, python. The sed program is a stream editor and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the input file or files. Its language is based on ed, the Unix editor, and … Read more
Update: && and || have finally come to PowerShell (Core), namely in v7; see this answer. Many years after the question was first asked, let me summarize the state of affairs as of PowerShell v5.1: Bash’s / cmd‘s && and || control operators have NO PowerShell equivalents, and since you cannot define custom operators in … Read more
In C# you can define extension methods on enums, and this makes up for some of the missing functionality. You can define Planet as an enum and also have extension methods equivalent to surfaceGravity() and surfaceWeight(). I have used custom attributes as suggested by Mikhail, but the same could be achieved using a Dictionary. using … Read more
XSLT equivalents for JSON – a list of candidates (tools and specs) Tools 1. XSLT You can use XSLT for JSON with the aim of fn:json-to-xml. This section describes facilities allowing JSON data to be processed using XSLT. 2. jq jq is like sed for JSON data – you can use it to slice and … Read more
DiveIntoPython – Everything Is an Object Everything in Python is an object, and almost everything has attributes and methods. All functions have a built-in attribute __doc__, which returns the doc string defined in the function’s source code. The sys module is an object which has (among other things) an attribute called path. And so forth. … Read more
Python 3.6 will add literal string interpolation similar to Ruby’s string interpolation. Starting with that version of Python (which is scheduled to be released by the end of 2016), you will be able to include expressions in “f-strings”, e.g. name = “Spongebob Squarepants” print(f”Who lives in a Pineapple under the sea? {name}.”) Prior to 3.6, … Read more