Function ParseInt

src/math.test.ts:6–10

()

  const whitespaceMay = /^\s*/;

  function* ParseInt() {
    const isNegative: boolean = yield has('-');
    const [stringValue]: [string] = yield /^\d+/;
    return parseInt(stringValue, 10) * (isNegative ? -1 : 1);
  }

  type Operator = '+' | '-' | '*' | '/';