Parses a string containing a number literal into a number.
Like parse except that this function returns null
for invalid inputs instead of throwing.
static num tryParse(String input) { String source = input.trim(); // TODO(lrn): Optimize to detect format and result type in one check. return int.tryParse(source) ?? double.tryParse(source); }
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https://api.dartlang.org/stable/2.0.0/dart-core/num/tryParse.html