RickN questions

RickN answers

• Is it valid practice to set an 'expire_at' field to null to cancel expiration in MongoDB?
• Why does the css function mod() 2 show the results 2 sometimes when the browser window is resized?
• next() is not a function unable to use generators in NodeJS
• Why PHP isset and Null coalescing operator is throwing Notice with concatenation operator? [duplicate]
• more than one 2d index, not sure which to run geoNear on
• Remove record WHERE it is older than 10 mins in MongoDB?
• How to get around server flooding by users opening countless tabs?
• How to prevent one file from .htaccess redirect?
• Purpose of complex (curly) syntax outside a string representation
• How to load MySQLi result set into two-dimensional array?