javascript get first 10 characters of string

1String.substring(0, 2);
2//Return the first two characters of the string
3//First parameter is the starting index, 0 corresponding to the first character
4//Second parameter is the number of character to return

1let str = 'John Wick'
2let firstChar = str.charAt(0) 
3console.log(firstChar); // "J" 

1var str = "Hello world That is reallly neat!";
2var res = str.substring(0, 5);//get first 5 chars

1const string = "0123456789";
2console.log(string.slice(0, 2)); // "01"
3console.log(string.slice(0, 8)); // "01234567"
4console.log(string.slice(3, 7)); // "3456"

1String.substring(0, 10);

1var str = "Hello world!";
2var res = str.substring(1, 4); //ell