How to create an array in javascript with element at specific position only?

Question

I need to create an array in Javascript with only one (or more) given element at a given position.

See the following snippet:

 params = []; params[5] = "my value" params[14] = "my other value"; console.log(params); 

All the elements that I don't initialize are (as expected) undefined. Can I delete these undefined elements, before or after the array is created?

Also, what happens if I set the array as POST data for a JQuery $.ajax() call?

Answer 1

Why don't you just use an object then?

params = {};

params[5] = "my value"
params[14] = "my other value";

console.log(params);

Answer 2

You can use Associative Arrays as also

  var person = [];
person[0] = "John";
person[10] = "Doe";
person[20] = 46;

    console.log(person);

array=(
'key1'=>''value1,
'key2'=>''value2
);

if you want to use in loop

result=array()
for(i=10;i<5;i++){

array1=(
'key1'=>''value1,
'key2'=>''value2
);
result=array1;
}

console.log(result)