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Get a substring of a String. The starting index is inclusive (the corresponding character is included in the substring), but the optional ending index is exclusive (the corresponding character is not included in the substring). If the ending index is omitted, the substring continues to the end of the String.
string.substring(from)
string.substring(from, to)
string: a variable of type String
from: the index to start the substring at
to (optional): the index to end the substring before
the substring
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