![Manipulating Characters in a String (The Java™ Tutorials > Learning the Java Language > Numbers and Strings) Manipulating Characters in a String (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)](https://docs.oracle.com/javase/tutorial/figures/java/objects-substring.gif)
Manipulating Characters in a String (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)
GitHub - devictoribero/implementation-prototype-string-indexof: Implementation of the String Prototype indexOf method in Vanilla Javascript.
![Manipulating Characters in a String (The Java™ Tutorials > Learning the Java Language > Numbers and Strings) Manipulating Characters in a String (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)](https://docs.oracle.com/javase/tutorial/figures/java/objects-lastIndexOf.gif)