Jquery: variable declared and get variable after split [duplicate] - javascript

This question already has answers here:
"Variable" variables in JavaScript
(9 answers)
jQuery : how to access the name of the element [duplicate]
(3 answers)
Closed 1 year ago.
I have 2 variables.
var a = 1;
var b = 2;
Now I have 2 input boxes with name 'form-1-a' and 'form-1-b'.
I need to put variables in these input boxes. Please look at below code as it is not working.
$("input[name^='form-']").val(eval($(this).attr('name').split('-')[2]));
Though entire code is bit complex but simplified and it does not seem to work without any error message.
Javascript is fun and pain at same time.
Below code worked.
$("input[name^='form-']").each(function(){
$(this).val(eval($(this).attr('name').split('-')[2]))
});

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I am seeing it crop up more and more in code I am going through on a new project (can't share due to contractual reasons) where Ill see something like:
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let varone = "vartwo";
let vartwo = "answer";
And I would like to get "answer". But I cannot do the following:
console.log(vartwo);
How can I get "answer", but not by including "vartwo" in my code?
I think one way to resolve it, is by using javascript objects, as shown:
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Reference to variable versus "actual" variable (PHP vs Javascript) [duplicate]

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In the Javascript code:
var people = [{name:"john",age:20},{name:"bob",age:30},{name:"kate",age:40}];
people.forEach(function(person,i){
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console.log(people) would give
[{name:"john",age:20,isHuman:true},{name:"bob",age:30,isHuman:true},{name:"kate",age:40,isHuman:true}]
However, the same code in PHP
$people = [["name"=>"john","age"=>20],["name"=>"bob","age"=>30],["name"=>"kate","age"=>40]];
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var_dump($people) would give
[["name"=>"john","age"=>20],["name"=>"bob","age"=>30],["name"=>"kate","age"=>40]]
The new "isHuman" property is not added to the original array of objects.
In the PHP case, I know you can do "$people[$i]['isHuman']=true" to alter the object in the original array. But is there a way to do "$person['isHuman']=true" and have that change reflected in the original array?
And my second question is why/for what reasons is this behavior different between Javascript and PHP?

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Is it possible to use button attribute as a variable name of an array in JavaScript? I tried to do it as follows but it returns syntax error.
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How insert variable in JS [duplicate]

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I need help, how to insert variable n as XX. Variable n is number, for example 3 and I need to get this number to document.form1.any3.value; is it possible? Thanks for advice
function pokus(n){
var any1 = document.form1.anyXX.value;
}
Use square bracket notation:
function pokus(n){
var any1 = document.form1['any'+n].value;
}

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