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Vyacheslav Egorov 2023-02-03 13:59:07 +02:00
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```
The default iteration order for tables is specified to be consecutive for elements `1..#t` and unordered after that, visiting every element; similarly to iteration using `pairs`, modifying the table entries for keys other than the current one results in unspecified behavior.
## String interpolation

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---
layout: single
title: "String Interpolation"
---
String interpolation is the new syntax introduced to Luau that allows you to create a string literal with expressions inside of that string literal.
In short, it's a safer and more ergonomic alternative over `string.format`.
Here's a quick example of a string interpolation:
```lua
local combos = {2, 7, 1, 8, 5}
print(`The lock combination is {table.concat(combos)}. Again, {table.concat(combos, ", ")}.`)
--> The lock combination is 27185. Again, 2, 7, 1, 8, 5.
```
String interpolation also composes well with `__tostring` metamethod.
```lua
local balance = setmetatable({ value = 500 }, {
__tostring = function(self)
return "$" .. tostring(self.value)
end
})
print(`You have {balance}!`)
--> You have $500!
```
Known Limitations
Script editor will not support auto-formatting string interpolations.
Luau currently does not define any format specifiers for string interpolations.
Luau currently does not support any_function_call`with backticks without parentheses`.
Luau currently does not support backtick string literals as a type annotation, so type Foo = `Foo` is invalid.
Please post any comments or concerns you may have!