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getBySelector

export const obj = {
  selector: { to: { toutiao: "FE coder" } },
  target: [1, 2, { name: "byted" }],
};

const getBySelector = (...args) => {
  const source = args[0];
  const selectors = args.slice(1);
  const res: any[] = [];
  selectors.forEach((s) => {
    const arr = s.split(/\.|\[|\]/g);
    const notEmptyArr = arr.filter((v) => v);
    const v = notEmptyArr.reduce((prev, item) => {
      return prev?.[item];
    }, source);
    res.push(v);
  });
  return res;
};
getBySelector(obj, "selector.to.toutiao", "target[0]", "target[2].name");

formatWithComma

const test: string = "1234567890";
const formatWithComma = (s: string) => {
  if (s.length < 4) {
    return s;
  }
  let res = "";
  const seperator_char = ",";
  const seperator_space = 3;
  let count = 0;
  for (let i = s.length - 1; i >= 0; i--) {
    count++;
    res = s[i] + res;
    if (count === seperator_space) {
      res = seperator_char + res;
      count = 0;
    }
  }
  return res;
};
console.log(formatWithComma(test), "Test utils is running");

mergeSortedArray

export const mergeSortedArr = (a: Array<number>, b: Array<number>) => {
  if (a.length < 1) {
    return b;
  }
  if (b.length < 1) {
    return a;
  }
  try {
    const merged = [];
    let i = 0;
    let j = 0;
    while (a[i] && b[j]) {
      if (a[i] <= b[j]) {
        merged.push(a[i]);
        i++;
      } else {
        merged.push(b[i]);
        j++;
      }
    }
    while (i < a.length) {
      merged.push(a[i]);
      i++;
    }
    while (j < b.length) {
      merged.push(b[j]);
      j++;
    }
    return merged;
  } catch (e) {
    console.log(`===${e}===`);
  }
};