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MAC:Wed Jan 19:09:23:~> ssh morrison@cs.ncssm.edu
morrison@cs.ncssm.edu's password: 
Permission denied, please try again.
morrison@cs.ncssm.edu's password: 
Last failed login: Wed Jan 19 09:23:24 EST 2022 from 172.31.248.160 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Tue Jan 18 11:17:43 2022 from 172.31.248.160
CSWed Jan 19:09:23:~> node
> x = 5
5
> typeof x
'number'
> typeof 5
'number'
> let y = 5;
undefined
> x*y
25
> //REPL read evaluate  print loop
undefined
> // Python, Java, Ruby have REPLs
undefined
> // PEMDAS works for numbers
undefined
> 3**4**2
43046721
> 3**(4**2)
43046721
> Math.sqrt(5)
2.23606797749979
> Math.sin(0)
0
> Math.sin(90)
0.8939966636005579
> Math.sin(Math.PI/2)
1
> Math.PI/2 = 3
repl:1
Math.PI/2 = 3
^^^^^^^^^

ReferenceError: Invalid left-hand side in assignment
    at Object.createScript (vm.js:80:10)
    at REPLServer.defaultEval (repl.js:197:21)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.onLine (repl.js:493:10)
    at REPLServer.emit (events.js:164:20)
    at REPLServer.Interface._onLine (readline.js:287:10)
    at REPLServer.Interface._line (readline.js:642:8)
    at REPLServer.Interface._ttyWrite (readline.js:922:14)
    at REPLServer.self._ttyWrite (repl.js:562:7)
> Math.PI = 3
3
> Math.PI
3.141592653589793
> let a = 3;   //block-scope assignment
undefined
> var a = 5;   //function scope assignment (not preferred)
SyntaxError: Identifier 'a' has already been declared
> var b = 5;   //function scope assignment (not preferred)
undefined
> const C = 4.57;
undefined
> C
4.57
> C = 17;
TypeError: Assignment to constant variable.
> CSWed Jan 19:09:42:~>