Cannot read properties of “undefined”

Content

typeof NaN "number" 9999999999999999 10000000000000000 0.50.10.6 true 0.10.20.3 false Math.max -Infinity Math.min() Infinity 2 "object Object" ) 0 truetruetrue3 true true-true ? true1 true true1 false (1 ! ). length 9 9"1" "91" 91-"1" 90 e0 true Thanks for inventing Javascript