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+---
+title: toPascalCase
+tags: string,regexp,intermediate
+firstSeen: 2021-09-08T19:21:13+00:00
+---
+
+Converts a string to pascalcase.
+
+- Use `String.prototype.match()` to break the string into words using an appropriate regexp.
+- Use `Array.prototype.map()`, `Array.prototype.slice()`, `Array.prototype.join()`, `String.prototype.toLowerCase()` and `String.prototype.toUpperCase()` to combine them, capitalizing the first letter of each one.
+
+```js
+const toPascalCase = str => {
+  const s =
+    str &&
+    str
+      .match(
+        /[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g
+      )
+      .map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())
+      .join('');
+  return s;
+};
+```
+
+```js
+toPascalCase('some_database_field_name'); // 'SomeDatabaseFieldName'
+toPascalCase('Some label that needs to be pascalized');
+// 'SomeLabelThatNeedsToBePascalized'
+toPascalCase('some-javascript-property'); // 'SomeJavascriptProperty'
+toPascalCase('some-mixed_string with spaces_underscores-and-hyphens');
+// 'SomeMixedStringWithSpacesUnderscoresAndHyphens'
+```
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