github.com/rakyll/go@v0.0.0-20170216000551-64c02460d703/src/unicode/digit.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package unicode
     6  
     7  // IsDigit reports whether the rune is a decimal digit.
     8  func IsDigit(r rune) bool {
     9  	if r <= MaxLatin1 {
    10  		return '0' <= r && r <= '9'
    11  	}
    12  	return isExcludingLatin(Digit, r)
    13  }