Rule of Naming Variables for Boolean [closed] - javascript

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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?'

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How to iterate and append characters of an array by push [closed]

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var charArray=[a,b,c]
I want to have a new array as following:
var charArrayNew=[a, ab, abc]
Please suggest how to get the result of charArrayNew in ES6 Javascript.
You could do this:
const charArray=['a','b','c'];
const answer = charArray.map((_,i,ar)=>ar.slice(0,i+1).join(""));
console.log(answer);
// or, alternatively:
fn=(ar,res=[])=>(
ar.reduce((a,c)=>(res.push(a+=c),a),""),res );
console.log(fn(charArray))

How to declare int array in Vue.JS? [closed]

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I am trying to declare an integer Array but don't know how to do this. Is it possible to declare a int array in Vue.
In your script , just add this below :
data(){
return {
your_array : [1,2,3,4,5,6]
}
}
your_array is just an example, the variable name can be any anything.

Which is preferred for typecasting to a String in JavaScript? String() or template literal? [closed]

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Let's say I have some variable that is probably a number.
Is it preferred to use String() or use a template literal to convert this variable to a string?
const n = 3.14;
let strN = String(n);
// OR
strN = `${n}`;
or does it not make any difference other than the obvious readability issues?
airbnb's styleguide suggests String(n).
// => this.reviewScore = 9;
// good
const totalScore = String(this.reviewScore);
airbnb Coercion: strings
You Don't Know JS - Types & Grammar: Coercion

Javascript Array to special Object [closed]

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I need for an Plugin an Object structure like this:
{
"Beer":145.53,
"Apple (red)":7.33,
"Apple (green)":0.03
}
Don't know how to write it that this shine.
I got the all values already so how to set it up like this?
Use this notation to make objects with those properties:
var obj = {};
obj["Beer"] = 145;
obj["Apple (red)"] = 7.5;
....

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.

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