JavaScript Type Coercion Pitfall: String Concatenation Instead of Number Addition This example demonstrates a common type coercion issue in JavaScript where the + operator performs string ...

About Unexpected string concatenation in JavaScript function. The function should add two numbers, but it concatenates a number and a string.

Java Quiz7 on Strings -- Why String concatenation for null works, but String length throws null pointer exception? This not exactly a quiz, I will explain this concept briefly in comments.