Difference between window[] and eval() - Javascript

Question

I\'ve been using both in javascript ... really don\'t know the difference. Googling always shows results for the \"window object\" or \"opening a new window in javascript\"

Answer 1

Both return a global variable's value. The difference is that if the global variable is undefined, you will get an error on executing eval() whereas window['variableName'] will return undefined(not an error) because accessing an undefined property is not an error but accessing an undefined variable is an error.