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The substr() method extract a part of a string and returns the extracted parts in a new string:
let str = "Apple, Banana, Kiwi";
document.getElementById("demo").innerHTML = str.substr(7,6);
The substr gives a start position and the length, e.g substr(7,6). The "7" is the start position and the "6" is the length of the selection. If a length is not given, the selection is to the end of the string.