Last login: Wed Jan 19 09:23:04 on ttys002

The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
MAC:Wed Jan 19:09:43:~> node
Welcome to Node.js v16.13.2.
Type ".help" for more information.
> let title = "Hello, there";
undefined
> title
'Hello, there'
> title[0]
'H'
> title[0]  = 'h';
'h'
> title
'Hello, there'
> title.charAt(0)
'H'
> title.contains("H")
Uncaught TypeError: title.contains is not a function
> title.length
12
> "some" + "thing"
'something'
> "some".concat("thing")
'something'
> 
> 
> "x
"x
^^

Uncaught SyntaxError: Invalid or unexpected token
> "x"*50
NaN
> "something".endsWith("g")
true
> "something".beginsWith("g")
Uncaught TypeError: "something".beginsWith is not a function
> "something".startsWith("g")
false
> // state, identity, behavior
undefined
> // state:  what an object KNOWS string: characgter sequence
undefined
> // identity:  an object's physical presence in memory
undefined
> // behavior:  what an object can DO
undefined
> // methods can depend on object state
undefined
> let q = "Cuckamonga";
undefined
> q.indexOf("o")
6
> q.charAt(q.indexOf("o"))
'o'
> q.indexOf("a")
4
> q.indexOf("a", 5)
9
> q.lastIndexOf("a")
9
> q.contains("z")
Uncaught TypeError: q.contains is not a function
> q.contains("z")
Uncaught TypeError: q.contains is not a function
> q
'Cuckamonga'
> q.includes("z")
false
> q.substring(q.indexOf("a")+ 1, q.lastIndexOf("a"))
'mong'
> 
MAC:Wed Jan 19:10:02:~>