Blow Quote by Scott Meyers

“The type of undefined is undefined. Why?”

— Eric Freeman

“When things consistently fail to compute, it does point to a consistently undefined possibility.”

— Edwin F. Becker

“What does it mean to assign the value null to a variable? How about “We intend to assign an object to this variable at…

— Eric Freeman

“Dividing a number by zero doesn’t produce an infinitely large number as an answer. The reason is that division is defined as the inverse…

— Ted Chiang

“undefined and NaN are not constants. They are global variables, and you can change their values. That should not be possible, and yet it…

— Douglas Crockford

What should we gain by a definition, as it can only lead us to other undefined terms?

— Ludwig Wittgenstein

“There are five falsey values in JavaScript: undefined is falsey. null is falsey. 0 is falsey. The empty string is falsey. NaN is falsey.”

— Eric Freeman

Testing shows the presence, not the absence of bugs.

— Edsger Dijkstra

“When you call an object’s method, this is set to the object whose method was called. If the method is not found in that…

— Eric Freeman

“Engineers can compute but not define, mathematicians can define but not compute, economists can neither define nor compute.”

— Nassim Nicholas Taleb

Usually its users discover sooner or later that their program does not deliver all the desired results, or worse, that the results requested were…

— Niklaus Wirth

Invisible doesnt mean it doesnt exist but neither does it mean that it exists

— Kevin Knight