- abstract. boolean. break. byte. case. catch. char. class. continue. const. debugger. default. delete. …
- final. finally. for. goto. if. implements. import. in. instanceof. int. interface. long. …
- public. return. short. static. super. switch. synchronized. this. throw. throws. transient. true.
The try statement allows you to define a block of code to be tested for errors while it is being executed. The catch statement allows you to define a block of code to be executed, if an error occurs in the try block.
What are keywords in JS?
Why ! Is false?
! evaluates to false because the reference is truthy.  can be converted to an number (0 in this case) which is falsey. Therefore: the condition passes as equal.
How do substring () and substr () differ?
The difference between substring() and substr()
The arguments of substring() represent the starting and ending indexes, while the arguments of substr() represent the starting index and the number of characters to include in the returned string.