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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 to create object inside object in JS [closed]

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I want to create an object inside an object in JavaScript like this:
{
"test": {
{},
{}
}
}
In more detail, I want to create a new object if "test" doesn't exist in the object, and create a new object in the same location as the old one if "test" exists.
Please help if this is possible.

You mean, like:
theObject["test"] = {};
this?
It's just an assignment, mate!

You need to give a key in every object you create in JavaScript.
E.g.:
var obj = {
objInside: {}
}
you can read more about object literals.

Rule of Naming Variables for Boolean [closed]

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how should I name for variables on type Boolean like 'Mom is away from keyboard'.
var momIsAwayFromKeyboard = mom.isAwayFromKeyborad;
is correct??

You could use a destructuring assignment:
let {isAwayFromKeyboard} = mom;
In this way you need only to write the variable name once and there will no difference b/w key and variable name.
let mom = {
isAwayFromKeyborad:true
}
let {isAwayFromKeyborad} = mom;
console.log(isAwayFromKeyborad)

Usually, you start with 'is'.
I think a good, short, descriptive name could be:
isMomAFK
or
isMomAway
Think of it as a true/false question: 'Is Mom away from keyboard?'

Remove an array-Javascript [closed]

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I have an array like this:
var animals=["cat","dog","snake","rhino"];
But sometimes I have to delete this array(remove it from the dom).
I have tried animals.remove; and $(animals).remove() and animals.remove() but none of them did the trick.Any ideas?

var animals=["cat","dog","snake","rhino"];
then to clear it do:
animals=[];
or
animals.length=0;
or
while(animals.length > 0) {
animals.pop();
}

Just assign the animals array to a value undefined and the array data will be dereferenced and garbage collected.
Donot try to call delete operator that is explicit removal.
animals = undefined
OR
animals = void 0
Thanks

Just Clear The Array
Using This 2 Methods
animals.length =0
animals=[];

Javascript declaration [closed]

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Hi this is a simple question. I was wondering is there any different when you declare something like this. Thanks
selectedData[key](val)
and
selectedData[key] = val

This line selectedData[key](val) is not a declaration, it's calling the function that is stored under the key key in the object selectedData and it's passing the parameter val to that function.
The other line selectedData[key] = val is assigning the value val to the key key in the object selectedData.

In the first case, you're calling whatever is in selectedData[key] as a function with val as an argument while in the second one you're assigning it.