Generate string from an array?

Example I have an array

all_object = ['A', 'B', 'C']

and I want to create a string from this array is


if all_object = ['A', 'B', 'C','D']

it will become


may I know how does I archive this?

There is no A or B or C in result? Only string AND string? I think you are looking how to join array elements
See this to find how to ... Array.prototype.join() - JavaScript | MDN

Ohh fully understood right now! thanks you very much!
I loop first

    for (i = 0; i < all_object.length; i++) {

newObject= newObject.join("AND");

and everything done!

You don't need the loop, just
`newObject= all_object.join("AND")

That will not affect all_object

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