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In certain computer programming languages, the Elvis operator, often written ?:, is a binary operator that returns the evaluated first operand if that operand evaluates to a value likened to logically true (according to a language-dependent convention, in other words, a truthy value), and otherwise returns the evaluated second operand (in which case the first operand evaluated to a value ...
The detailed semantics of "the" ternary operator as well as its syntax differs significantly from language to language. A top level distinction from one language to another is whether the expressions permit side effects (as in most procedural languages) and whether the language provides short-circuit evaluation semantics, whereby only the selected expression is evaluated (most standard ...
A program would have to perform reaching definition analysis to determine this. But if the program is in SSA form, both of these are immediate: y 1 := 1 y 2 := 2 x 1 := y 2. Compiler optimization algorithms that are either enabled or strongly enhanced by the use of SSA include:
If-then-else flow diagram A nested if–then–else flow diagram. In computer science, conditionals (that is, conditional statements, conditional expressions and conditional constructs) are programming language constructs that perform different computations or actions or return different values depending on the value of a Boolean expression, called a condition.
Technically, Perl does not have a convention for including block comments in source code, but POD is routinely used as a workaround. PHP. PHP supports standard C/C++ style comments, but supports Perl style as well. Python. The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [19]
Developers can use new JavaScript language features by using Babel to convert their source code into versions of JavaScript that a Web browser can process. [5] Babel can also be used to compile TypeScript into JavaScript. [6] The core version of Babel was downloaded 5 million times a month in 2016, and this increased to 16 million times a week ...
See also: the {{}} template. The #if function selects one of two alternatives based on the truth value of a test string. {{#if: test string | value if true | value if false}} As explained above, a string is considered true if it contains at least one non-whitespace character.
There are also debugging utilities that map the transcompiled source code back to the original code; for example, the JavaScript Source Map standard [citation needed] allows mapping of the JavaScript code executed by a web browser back to the original source when the JavaScript code was, for example, minified or produced by a transcompiled-to ...