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

Strings are objects within the JavaScript language. ... Converts the entire string to upper case. Note: The concat, match, replace, and search functions were added in JavaScript 1.2.

JavaScript's loose type system can lead to unexpected behavior when adding numbers and strings. The '+' operator performs string concatenation when one operand is a string. - Bug-Hunter ...