docs: update documentation

docs/QE/Advanced/case.md

@@ -1,4 +1,4 @@
-# Case
+# case
 
 The case expression is a powerful tool that allows you to handle multiple conditions in your code, similar to an
 if-then-else statement in standard programming languages.

docs/QE/Advanced/exists.md

@@ -23,4 +23,15 @@ $queryResult = Author::select(
         Book::where('books.author_id', c('authors.id'))
     )->as('has_book')
 )->get();
+```
+
+```php
+$suppliers = DB::table('suppliers')->select(
+    'id',
+    'name',
+)->whereRaw(
+    QE::exists(
+        Db::table('products')->where('products.supplier_id', c('suppliers.id'))->where('price', '<', 25)
+    )
+)->toSql();
 ```

docs/QE/Advanced/isNull.md

@@ -14,6 +14,15 @@ use function sbamtr\LaravelQueryEnrich\c;
 $books = Book::select(
     'id',
     'name',
-    QE::isNull(c('description'))->as('is_null')
+    QE::isNull(c('description'))->as('is_description_null')
 )->get();
-```
+```
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$books = DB::table('books')->whereRaw(
+    QE::isNull(c('description'))
+)->get();
+```

docs/QE/String/contains.md

@@ -0,0 +1,28 @@
+# contains
+
+The `contains` function checks if a provided string contains a specified substring. To use it, you pass two
+parameters: `$haystack` (the full string) and `$needle` (the substring you're looking for). The method then returns a
+Boolean, letting you know if the string contains the specified substring.
+
+## Example Usage
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::select(
+    'id',
+    'first_name',
+    'last_name',
+    QE::startsWith(c('first_name'), 'A')->as('is_first_name_starting_with_a')
+)->get();
+```
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::whereRaw(
+    QE::startsWith(c('first_name'), 'Walt')
+)->get();
+```

docs/QE/String/endsWith.md

@@ -0,0 +1,28 @@
+# endsWith
+
+The `endsWith` function checks if a provided string ends with a specified substring. To use it, you pass two
+parameters: `$haystack` (the full string) and `$needle` (the substring you're looking for). The method then returns a
+Boolean, letting you know if the string ends with the specified substring.
+
+## Example Usage
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::select(
+    'id',
+    'first_name',
+    'last_name',
+    QE::endsWith(c('first_name'), 'Junior')->as('is_first_name_ending_with_junior'))
+)->get();
+```
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::whereRaw(
+    QE::endsWith(c('first_name'), 'Junior')
+)->get();
+```

docs/QE/String/md5.md

@@ -0,0 +1,18 @@
+# md5
+
+The `md5` method, belonging to the Advanced namespace, is a static function to calculate the MD5 hash for a given
+parameter.
+
+## Example Usage
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$books = Book::select(
+    'id',
+    'name',
+    'price',
+    QE::md5(QE::concatWS(',', c('name', 'price')))->as('checksum')
+)->get();
+```

docs/QE/String/startsWith.md

@@ -0,0 +1,28 @@
+# startsWith
+
+The `startsWith` function checks if a provided string starts with a specified substring. To use it, you pass two
+parameters: `$haystack` (the full string) and `$needle` (the substring you're looking for). The method then returns a
+Boolean, letting you know if the string starts with the specified substring.
+
+## Example Usage
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::select(
+    'id',
+    'first_name',
+    'last_name',
+    QE::startsWith(c('first_name'), 'A')->as('is_first_name_starting_with_a')
+)->get();
+```
+
+```php
+use sbamtr\LaravelQueryEnrich\QE;
+use function sbamtr\LaravelQueryEnrich\c;
+
+$people = People::whereRaw(
+    QE::startsWith(c('first_name'), 'Walt')
+)->get();
+```