arpit-code-review.ts

// write a funcction which will find the number of time
// a character is repeated in a string
// input: aabbcccddefb
// output: { a: 2, b: 3,c: 3, d: 2, e: 1,f:1}

export function charOccurance(string: string) {
  let freq: Record<string, number> = {};
  const strArr = Array.from(string);
  strArr.forEach(char => {
    if (freq[char]) {
      freq[char] += 1;
    } else {
      freq[char] = 1;
    }
  });
  return freq;
}
  
// Write a function to flat a array
// input: [[1],2,3,[4,5,[6,7]]]
// output: [1,2,3,4,5,6,7]

export function flatArray(arr: any[]) {
  let flatArr: any[] = [];
  arr.forEach(item => {
    if (Array.isArray(item)) {
      flatArr = flatArr.concat(flatArray(item));
    } else {
      flatArr.push(item);
    }
    return flatArr;
  });

  return flatArr;
}

console.log(charOccurance("aabbcccddefb"));
console.log(flatArray([[1], 2, 3,[[[[[[6]]]]]], [4, 5, [6, 7]]]));