The Kotlin compiler translates this code to: new StringBuilder().append(“Hello, “).append(name).append(“!”).toString() There is no caching performed: every time you evaluate an expression containing a string template, the resulting string will be built again.
Looking at the source for the default interpolators (found here: https://github.com/scala/scala/blob/2.11.x/src/library/scala/StringContext.scala) it looks like the “raw” interpolator calls the identity function on each letter, so what you put in is what you get out. The biggest difference that you will find is that if you are providing a string literal in your source that includes … Read more
What you have should work. It’s the correct syntax. There’s also a convenient method on the “System.FormattableString” abstract class which has the same effect as the suggested “INV” helper method. using static System.FormattableString; … string x = Invariant($”The value is {m}”);
Instead of using ”’ for the GString or multi-line string use “”” def cretanFood = “Dakos” def mexicanFood = “Tacos” def bestRestaurant = “””${mexicanFood} & ${cretanFood}””” print bestRestaurant​ GString enclosed in ”’ will not be able to resolve the placeholder – $. You can find more details in the Groovy Documentation under the heading String … Read more
In C++20 you will be able to use std::format. This will support python style formatting: string s = std::format(“{1} to {0}”, “a”, “b”); There is already an implementation available: https://github.com/fmtlib/fmt.
As per SE-0054, ImplicitlyUnwrappedOptional<T> is no longer a distinct type; there is only Optional<T> now. Declarations are still allowed to be annotated as implicitly unwrapped optionals T!, but doing so just adds a hidden attribute to inform the compiler that their value may be force unwrapped in contexts that demand their unwrapped type T; their … Read more
Rust has string formatting. fn main() { let a = “AAA”; let b = format!(“BBB {}”, a); println(b); } // output: BBB AAA In the Rust version, there is no additional repetition but you must explicitly call format!() and the inserted values are separated from the string. This is basically the same way that Python … Read more
Whatever works best for you works… But if you want to go for speed use this: echo ‘Welcome ‘, $name, ‘!’; The single quotes tell PHP that no interpretation is needed, and the comma tells PHP to just echo the string, no concatenation needed.
No. The idea is explicitly dismissed in the PEP: For the same reason that we don’t support bytes.format(), you may not combine ‘f’ with ‘b’ string literals. The primary problem is that an object’s __format__() method may return Unicode data that is not compatible with a bytes string. Binary f-strings would first require a solution … Read more
See String.format method. String s = “hello %s!”; s = String.format(s, “world”); assertEquals(s, “hello world!”); // should be true