Camel case and snake case: Difference between revisions

=={{header|Wren}}==

{{libheader|Wren-str}}

{{libheader|Wren-fmt}}

Well, I'm not entirely sure what I'm doing here as a result of space and hyphen being treated as equivalent to underscore but, in the case of the 'to snake' conversion:

1. I've retained any hyphens in the result string but replaced spaces with underscores as it says that white space is not permitted as part of the variable name.

2. I've assumed that an underscore should not be added if the previous character was already a separator.

<lang ecmascript>import "./str" for Char

import "/fmt" for Fmt

var toCamel = Fn.new { |snake|

snake = snake.trim()

var camel = ""

var underscore = false

for (c in snake) {

if ("_- ".contains(c)) {

underscore = true

} else if (underscore) {

camel = camel + Char.upper(c)

underscore = false

} else {

camel = camel + c

}

}

return camel

}

var toSnake = Fn.new { |camel|

camel = camel.trim().replace(" ", "_") // we don't want any spaces in the result

var snake = ""

var first = true

for (c in camel) {

if (first) {

snake = snake + c

first = false

} else if (!first && Char.isUpper(c)) {

if (snake[-1] == "_" || snake[-1] == "-") {

snake = snake + Char.lower(c)

} else {

snake = snake + "_" + Char.lower(c)

}

} else {

snake = snake + c

}

}

return snake

}

var tests = [

"snakeCase", "snake_case", "variable_10_case", "variable10Case", "ɛrgo rE tHis",

"hurry-up-joe!", "c://my-docs/happy_Flag-Day/12.doc", " spaces "

]

System.print(" === to_snake_case ===")

for (camel in tests) {

Fmt.print("$33s -> $s", camel, toSnake.call(camel))

}

System.print("\n === toCamelCase ===")

for (snake in tests) {

Fmt.print("$33s -> $s", snake, toCamel.call(snake))

}</lang>

{{out}}

<pre>

=== to_snake_case ===

snakeCase -> snake_case

snake_case -> snake_case

variable_10_case -> variable_10_case

variable10Case -> variable10_case

ɛrgo rE tHis -> ɛrgo_r_e_t_his

hurry-up-joe! -> hurry-up-joe!

c://my-docs/happy_Flag-Day/12.doc -> c://my-docs/happy_flag-day/12.doc

spaces -> spaces

=== toCamelCase ===

snakeCase -> snakeCase

snake_case -> snakeCase

variable_10_case -> variable10Case

variable10Case -> variable10Case

ɛrgo rE tHis -> ɛrgoRETHis

hurry-up-joe! -> hurryUpJoe!

c://my-docs/happy_Flag-Day/12.doc -> c://myDocs/happyFlagDay/12.doc

spaces -> spaces

</pre>