remove first 3 characters from string javascript

1let str = 'Hello';
2 
3str = str.slice(1);
4console.log(str);
5 
6/*
7    Output: ello
8*/
9

1var string = "abcd";
2console.log(string.substring(3)); //"d"

1let str = " hello";
2str = str.substring(1);

1var oldStr ="Hello";
2var newStr = oldStr.substring(1); //remove first character "ello"
3

1let str = 'Hello';
2 
3str = str.substring(1);
4console.log(str);
5 
6/*
7    Output: ello
8*/
9

1// this will replace the first occurrence of "www." and return "testwww.com"
2"www.testwww.com".replace("www.", "");
3
4// this will slice the first four characters and return "testwww.com"
5"www.testwww.com".slice(4);
6
7// this will replace the www. only if it is at the beginning
8"www.testwww.com".replace(/^(www\.)/,"");