Addition Is Not Working In JavaScript
Answer : One or both of the variables is a string instead of a number. This makes the + do string concatenation. '2' + 2 === '22'; // true 2 + 2 === 4; // true The other arithmetic operators / * - will perform a toNumber conversion on the string(s). '3' * '5' === 15; // true A quick way to convert a string to a number is to use the unary + operator. +'2' + 2 === 4; // true ...or with your variables: +x + +y + has two uses. One is addition, the other however is string concatenation. If one or both of your variables is a string, then + will concatenate them. You will need to use parseInt or parseFloat to turn a string into a number. In Javascript the + operator can either perform addition or concatenation depending on the type of its operands. When numbers are used with + it uses addition, but when strings are used with + it concatenates (joins the strings) instead