The slice() method is used to extract a part of a string.
It takes two arguments:
-
start-index -
The index of the string from which the substring is to be extracted.
-
end-position -
The index of the string up to which the substring is to be extracted.
The character in this index won't be included in the substring.
The default value of this argument is the length of the string.
In the example given above,
message.slice(12, 27)
extracts a substring starting from the index 12
to the index 26, from the value of message.
In the example given above,
message.slice(5)
extracts a substring starting from the index 5
to the last index of the string 69, from the value of message.
We can also pass negative values as the argument.
A negative value means the index is equal to
the length of the string minus the absolute value of that argument.
In the example given above,
message.slice(5, -7) is the same as writing,
message.slice(5, message.length - 7).
Let's take a look at another example where
only the first argument is passed
and
it's a negative value.
In the example given above,
message.slice(-14)
extracts a substring starting from the index equal to message.length - 14 or 56
to the last index of the string 69, from the value of message.