Form Array by Concatenating Subarrays of Another Array LeetCode solution in JavaScript

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/**
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 * @param {number[][]} groups
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 * @param {number[]} nums
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 * @return {boolean}
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 */
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var canChoose = function (groups, nums) {
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  let i = 0;
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  for (
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    let start = 0;
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    i < groups.length && groups[i].length + start <= nums.length;
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    start++
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  ) {
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    if (search(groups[i], nums, start)) {
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      start += groups[i].length - 1;
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      i++;
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    }
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  }
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  return i == groups.length;
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  function search(group, nums, start) {
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    for (let i = 0; i < group.length; i++) {
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      if (group[i] != nums[i + start]) return false;
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    }
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    return true;
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  }
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};