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please help me with this question(from the book of Stefan Stoyanov):
Imagine the String() constructor didn’t exist. Create a constructor function MyString() that acts like String() as closely as possible. You’re not allowed to use any built-in string methods or properties, and remember that String() doesn’t exist. You can use this code to test your constructor:
>>>
var s = new MyString(‘hello’);
>>> s.length;
5
>>> s[0];
“h”
>>> s.toString();
“hello”
>>> s.valueOf();
“hello”
>>> s.charAt(1);
“e”
>>> s.charAt(‘2’);
“l”
>>> s.charAt(‘e’);
“h”
>>> s.concat(‘ world!’);
“hello world!”
>>> s.slice(1,3);
“el”
>>> s.slice(0,-1);
“hell”
>>> s.split(‘e’);
[“h”, “llo”]
>>> s.split(‘l’);
[“he”, “”, “o”]
*You can use a for-in to loop through the input string, treating it as
an array.