format method

String format(String format)

Enter format to replace the value of double with a string.

The following patterns can be used for format.

formatを入力してdoubleの値を文字列に置き換えます。

formatには下記のパターンを使用することが可能です。

• 0 A single digit
• # A single digit, omitted if the value is zero
• . Decimal separator
• - Minus sign
• , Grouping separator
• E Separates mantissa and expontent
• + - Before an exponent, to say it should be prefixed with a plus sign.
• % - In prefix or suffix, multiply by 100 and show as percentage
• ‰ (\u2030) In prefix or suffix, multiply by 1000 and show as per mille
• ¤ (\u00A4) Currency sign, replaced by currency name
• ' Used to quote special characters
• ; Used to separate the positive and negative patterns (if both present)

For example,

final d = 12.343;
print(d.format("###.0#")); // 12.34

Please note that decimal points will be rounded.

小数点を丸めるときは四捨五入されますのでご注意ください。

Implementation

String format(String format) {
  assert(format.isNotEmpty, "The format is empty.");
  return NumberFormat(format).format(this);
}