Distinct Echo Substrings LeetCode solution in JavaScript

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/**
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 * @param {string} text
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 * @return {number}
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 */
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var distinctEchoSubstrings = function (text) {
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  const store = new Set();
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  for (let i = 0; i < text.length; i++) {
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    for (let j = i + 1; j < text.length; j++) {
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      const left = text.substring(i, j);
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      const right = text.substring(j, j + j - i);
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      if (left === right) store.add(left);
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    }
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  }
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  return store.size;
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};