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What does the dollar sign mean in attribute? [closed]

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Today I saw this code:
e = [div] (div is html object)
if (e.empty(), y) {y.$sheet = e;}
How JS define y?
What is y.$sheet?
I tried to y = e.empty(), but it doesn't work (error with defining y.$sheet = e

How can I make a variable static in Js? [closed]

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I want the newid to be incremented when I call the function.

You make the function close over the variable, by declaring the variable in the surrounding context:
let newid = 3;
const generateTemplate = contact => {
// ...
newid++;
};

How can i get array key-values pair using javascript [closed]

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for(i=0;i<=array_values.length;i++){
var a=array_values[i].amounts;
var t=array_values[i].Tax;
alert(a);
alert(t);
}
Error : TypeError: array_values[i] is undefined
var a=array_values[i].amounts;
var a=array_values[i].amounts;

change
for(i=0;i<=array_values.length;i++)
to
for(i=0;i<array_values.length;i++)
<= to <

socket.io+ Node:Object #<Namespace> has no method 'clients' [closed]

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console.log(io.sockets.clients('test1234fgdgdfgdfg'));
It gives me error :
Object # has no method 'clients'

io.sockets.clients() can no longer be used after version Socket.IO version 1.0
Here's what you should use:
for (var clientId in io.sockets.adapter.rooms[roomId]) {
var clientSocket = io.sockets.connected[clientId];
}

Formatting String with pattern [closed]

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I have a String variable who represent date
console.log(goDate); --> "23/12/2014"
how I could turn this variable like this..?:
console.log(goDate); --> "2014-12-23".

var goDate = "23/12/2014"; // needs 2014-12-23
var newGoDate = goDate.split('/').reverse().join('-');