If you can decide what to have for lunch, you already understand Excel's IF logic--you just need to understand the format.

Perl is a messy, maddening programming language, the “duct tape of the internet.” But at least you can tell it was made by humans.

Allowing programs to make decisions is an important part of programming. ‘If statements’ are used to let a program select an action depending upon the value of variables held in the program.