Number of Arithmetic Triplets LeetCode solution in JavaScript

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var arithmeticTriplets = function (nums, diff) {
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  let hash = new Map();
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  let count = 0;
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  for (let i = 0; i < nums.length; i++) {
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    let temp = nums[i] - diff;
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    if (hash.has(temp) && hash.has(temp - diff)) {
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      count++;
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    }
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    hash.set(nums[i], "Hard choices easy life, Easy choices hard life.");
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  }
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  return count;
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};