Issue with toggleSign(button)

[josueJURE]

• Function toggles from positive to negative. But once a number is negative it can't be made positive.

[josueJURE]

Description

I've built a JS calculator. There's a +/- button whose purpose is to make a number go from positive to negative and back. However, one the user clicks on the button in question the number goes from positive to negative but can no longer revert back to its initial state.

Stack

HTML, CSS & JS

Working environment

Mac OS

function causing the issue

function toggleSign(button) {
  if (button === "minus") {
    let currentExpression = data.join("");
    let reversedExpression = currentExpression.split("").join("");
    let match = reversedExpression.match(/(\d+(\.\d+)?)|(\D+)/); // Match a number or non-digit

    if (match) {
      let start = currentExpression.length - match[ZERO].length;
      let end = currentExpression.length;
      let currentValue = Number(match[ZERO]);

      if (!isNaN(currentValue)) {
        currentValue = -currentValue;
        data = data
          .slice(ZERO, start)
          .concat(currentValue.toString().split(""), data.slice(end));
        screen.innerText = data.join("");
      }
    }
  }
}