write $ in text in flutter code example

Example 1: flutter text multiple styles

RichText(
  text: TextSpan(
    text: 'Hello ',
    style: DefaultTextStyle.of(context).style,
    children: <TextSpan>[
      TextSpan(text: 'bold', style: TextStyle(fontWeight: FontWeight.bold)),
      TextSpan(text: ' world!'),
    ],
  ),
)

Example 2: flutter text wisget

const Text(
  this.data, {
  Key key,
  this.style,
  this.strutStyle,
  this.textAlign,
  this.textDirection,
  this.locale,
  this.softWrap,
  this.overflow,
  this.textScaleFactor,
  this.maxLines,
  this.semanticsLabel,
  this.textWidthBasis,
  this.textHeightBehavior,
}) : assert(
       data != null,
       'A non-null String must be provided to a Text widget.',
     ),
     textSpan = null,
     _applyTextScaleFactorToWidgetSpan = true,
     super(key: key);