Minimize Result by Adding Parentheses to Expression LeetCode solution in JavaScript

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/**
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 * @param {string} expression
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 * @return {string}
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 */
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var minimizeResult = function (expression) {
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  const [left, right] = expression.split("+");
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  let res = [`(${expression})`, +left + +right];
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  for (let i = 0; i < left.length; i++) {
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    const i1 = left.slice(0, i) || 1;
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    const i2 = left.slice(i);
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    for (let j = 1; j <= right.length; j++) {
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      const j1 = right.slice(0, j);
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      const j2 = right.slice(j) || 1;
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      const tempTotal = i1 * (+i2 + +j1) * j2;
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      if (res[1] > tempTotal) {
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        res[0] = `${left.slice(0, i)}(${i2}+${j1})${right.slice(j)}`;
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        res[1] = tempTotal;
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      }
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    }
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  }
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  return res[0];
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};