mirror of
https://github.com/jbranchaud/til
synced 2026-01-03 15:18:01 +00:00
36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
# String Interpolation With Quoted Strings
|
|
|
|
Stapling strings together with the `++` operator can be tedious and clunky.
|
|
If you have string variables that you'd like to interpolate, you can piece
|
|
them together much more easily using [quoted
|
|
strings](https://reasonml.github.io/docs/en/string-and-char.html#quoted-string).
|
|
|
|
We can get close to a solution with the standard quoted string syntax.
|
|
|
|
```reason
|
|
let greeting = (greetee) => {
|
|
{|Hello, $(greetee)!|}
|
|
};
|
|
|
|
Js.log(greeting("World")); // => "Hello, $(greetee)!"
|
|
```
|
|
|
|
This isn't quite right though. We have to take advantage of a preprocessing
|
|
hook provided by
|
|
[Bucklescript](https://bucklescript.github.io/docs/en/common-data-types.html#interpolation).
|
|
The `j` hook supports unicode and allows variable interpolation.
|
|
|
|
```reason
|
|
let greeting = (greetee) => {
|
|
{j|Hello, $(greetee)!|j}
|
|
};
|
|
|
|
Js.log(greeting("World")); // => "Hello, World!"
|
|
```
|
|
|
|
To use this pre-processor we have to include `j` in the quoted string like
|
|
so `{j|...|j}`.
|
|
|
|
See a [live example
|
|
here](https://reasonml.github.io/en/try.html?reason=DYUwLgBA5gTi4EsB2UIF4IApbzPAlOgHwQDeAUBGQFYA+AEiMMAPYA0EAJNnOAQIS1qAX3LCA3OXIApAM4A6VlB65kygEQB1FjGAATdfnzigA).
|