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

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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

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how to set env in Sheel for node.js [closed]

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shell:$ set CONF = 44
const mytext = process.env.CONF console.log(mytext);
//undefined
In Powershell,
$Env:CONF = 'Hello, World!'

How to check in javascript if a list contains any element? [closed]

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How to check if a list is not empty?
if (serialNumbersList.Any()) //c# expression equivalent
{
// do stuff
}
In javascript there are no lists but arrays, and you can check their length property
if(serialNumberList.length > 0) {
// Do your stuff
}

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 <

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('-');

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