Quote by Douglas Crockford
““undefined and NaN are not constants. They are global variables, and you can change their values. That should not be possible, and yet it is. Don’t do it.””
““undefined and NaN are not constants. They are global variables, and you can change their values. That should not be possible, and yet it is. Don’t do it.””
![“suppress empty strings in the output array when the separator is a regular expression: var f = '|a|b|c|'.split(/\|/); // f is ['a', 'b', 'c'] on some systems, and // f is ['', 'a', 'b', 'c', ''] on others string.substring(start, end ) The substring method is the same as the slice method except…” quote by Douglas Crockford](https://sms4smile.com/quotes/img-quotes/566/douglas-crockford-19095_productivity_suppress-empty-strings-in-the-output-arr_751466.jpg)
