If you check the prototype of substr (see the MDN documentation), you can see that there is this second optional parameter length:
substr
length
String.prototype.substr = function(start: number, length: number = undefined): string
And the documentation states that
If length is omitted, substr() extracts characters to the end of the string.
So when you call word.substr(1), this is the equivalent of:
word.substr(1)
word.substr(1, word.length);
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If you check the prototype of
substr(see the MDN documentation), you can see that there is this second optional parameterlength:And the documentation states that
So when you call
word.substr(1), this is the equivalent of: