Strings

Casing, trimming, replacement, padding, slugify, truncate, mask, template, HTML helpers, Arabic detection. Import from @mongez/reinforcements.

Casing — powered by words()

All casing functions share a single tokenizer that handles acronyms correctly.

words

words(input: string): string[]

words("XMLHttpRequest");  // ["XML", "Http", "Request"]
words("AIAgent");         // ["AI", "Agent"]
words("hello-world");     // ["hello", "world"]

Casing family

Function	Signature	Example
toCamelCase	(str) => string	toCamelCase("XMLHttpRequest") → "xmlHttpRequest"
toStudlyCase	(str) => string	toStudlyCase("hello-world") → "HelloWorld"
toPascalCase	(str) => string	Alias of toStudlyCase
toSnakeCase	(str, separator?, lowerAll?) => string	toSnakeCase("AIAgent") → "ai_agent"
toKebabCase	(str, lowerAll?) => string	toKebabCase("getUserID") → "get-user-id"
toConstantCase	(str) => string	toConstantCase("apiBaseUrl") → "API_BASE_URL"
toDotCase	(str, lowerAll?) => string	toDotCase("helloWorld") → "hello.world"
toPathCase	(str, lowerAll?) => string	toPathCase("helloWorld") → "hello/world"
toTitleCase	(str, options?: { stopWords? }) => string	toTitleCase("the lord of rings") → "The Lord of Rings"

Letter case primitives

ucfirst(str: string): string                 // uppercase first char
capitalize(str: string): string              // ucfirst on every whitespace-separated word

ucfirst("hello");          // "Hello"
capitalize("hello world"); // "Hello World"

Trimming

Function	Signature	Notes
trim	(str, needle?: string) => string	Trims both ends (default whitespace)
ltrim	(str, needle?: string) => string	Start only
rtrim	(str, needle?: string) => string	End only

trim("  hi  ");          // "hi"
trim("---hi---", "-");   // "hi"
ltrim("//path", "/");    // "path"
rtrim("file.tmp", ".tmp"); // "file"

Replacement family

replaceAll(str, search, replacement): string
replaceFirst(str, search, replacement): string
replaceLast(str, search, replacement): string
removeFirst(str, needle): string     // = replaceFirst(str, needle, "")
removeLast(str, needle): string      // = replaceLast(str, needle, "")

search/needle are literal strings — they’re regex-escaped internally.

replaceAll("a-b-c", "-", "_");        // "a_b_c"
replaceFirst("foo foo foo", "foo", "bar"); // "bar foo foo"
replaceLast("foo bar foo", "foo", "baz");  // "foo bar baz"

repeatsOf

repeatsOf(str: string, needle: string, caseSensitive?: boolean): number  // default true

repeatsOf("abcabc", "a");       // 2
repeatsOf("AbcAbc", "a", false); // 2

Padding

pad(str, length, char?): string         // pad both sides; extra char goes to end
padStart(str, length, char?): string    // typed wrapper around String#padStart
padEnd(str, length, char?): string      // typed wrapper around String#padEnd

pad("hi", 6);       // "  hi  "
pad("hi", 7, "*");  // "**hi***"
padStart("7", 3, "0"); // "007"
padEnd("7", 3, "0");   // "700"

URL slugs & truncation

slugify

slugify(str, options?: {
  separator?: string;  // default "-"
  lower?: boolean;     // default true
  strict?: boolean;    // default true — strip non-alphanumeric per token
}): string

slugify("Hello, World!");                  // "hello-world"
slugify("café crème");                     // "cafe-creme"
slugify("Hello World", { separator: "_" }); // "hello_world"

truncate

truncate(str, length, options?: {
  suffix?: string;                  // default "..."
  byWord?: boolean;                 // default false — cut at word boundary
  position?: "end" | "middle";      // default "end"
}): string

truncate("hello world", 8);                          // "hello..."
truncate("hello world there", 14, { byWord: true }); // "hello world..."
truncate("abcdefghij", 7, { position: "middle" });   // "ab...ij"

readMoreChars / readMoreWords

readMoreChars(str, length, suffix?: string): string  // default suffix "..."
readMoreWords(str, wordCount, suffix?: string): string

readMoreChars("hello world", 5);     // "hello..."
readMoreWords("a b c d e", 3);       // "a b c..."

HTML & masking

escapeHtml / unescapeHtml

escapeHtml(str: string): string   // & < > " ' → entities
unescapeHtml(str: string): string // reverse

escapeHtml('<a href="x">');  // "&lt;a href=&quot;x&quot;&gt;"

stripHtmlTags

stripHtmlTags(str, options?: {
  replacement?: string;              // default ""
  stripScriptsAndStyles?: boolean;   // default true — drops content too
  stripComments?: boolean;           // default true
}): string

Not a sanitizer — for untrusted HTML, use DOMPurify.

stripHtmlTags("<p>Hello <b>world</b></p>");        // "Hello world"
stripHtmlTags("<script>alert(1)</script>safe");    // "safe"
stripHtmlTags("<p>hi</p>", { replacement: " " });  // " hi "

mask

mask(str, options?: {
  start?: number;  // visible chars from start, default 0
  end?: number;    // visible chars from end, default 0
  char?: string;   // mask char, default "*"
}): string

mask("4242424242424242", { start: 0, end: 4 });  // "************4242"
mask("hassan@gmail.com", { start: 2, end: 4 }); // "ha**********.com"

Templates

template

template(str: string, vars: Record<string, any>): string

{path} interpolation with dot-notation paths into vars. Missing paths render as "".

template("Hello {user.name}!", { user: { name: "Ada" } });
// "Hello Ada!"

template("{count} items", { count: 3 });
// "3 items"

Counting & reversal

wordCount(str: string): number
charCount(str: string, options?: { unicode?: boolean }): number  // grapheme-aware when true
reverse(str: string): string  // unicode-safe (handles surrogate pairs)

wordCount("hello world");          // 2
charCount("hello");                // 5
charCount("👨‍👩", { unicode: true }); // 1 (single grapheme)
reverse("hello");                  // "olleh"

Misc

initials

initials(name: string, separator?: string): string  // default separator ""

initials("Ada Lovelace");      // "AL"
initials("Ada Lovelace", "."); // "A.L"

extension

extension(filename: string): string

Returns the part after the last dot, or "" if absent.

extension("foo.txt");          // "txt"
extension("archive.tar.gz");   // "gz"
extension("README");           // ""

toInputName

toInputName(path: string): string

"a.b.c" → "a[b][c]" for HTML form name attributes.

toInputName("user.address.city"); // "user[address][city]"
toInputName("user.tags[]");        // "user[tags][]"

Arabic

startsWithArabic(str: string, trimmed?: boolean): boolean  // default trimmed = true
containsArabic(str: string): boolean
ARABIC_REGEX: RegExp                                       // /[؀-ۿ]/
ARABIC_PATTERN: RegExp                                     // @deprecated — same as ARABIC_REGEX

startsWithArabic("مرحبا");        // true
startsWithArabic("   مرحبا");     // true (trimmed)
containsArabic("hello مرحبا");    // true