Can we say that String is an object in Javascript?

Question

I\'m always confused when I hear strings are primitives in JS, because everybody knows that string has different methods like: length, indexOf, search etc.

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Answer 1

Not certainly in that way.

If you try to use a class method for a primitive, the primitive will be temporarily wrapped in an object of the corresponding class ("boxing") and the operation will be performed on this object. For example,

1..a = 2;

It's equal to:

num = new Object(1.);
num.a = 2;
delete num;

So, after executing the operation, the wrapper will be destroyed.

However, the primitive itself will remain unchanged:

console.log( 1..a ) // undefined