pairSum in javascript

pairsum.ts

const pairSumExplain = (array: Array<number>, target: number): Array<Array<number>> => {
  const length: number = array.length;
  const found: Array<Array<number>> = [];
  
  for(let i = 0; i < length; i++) {
    for(let j = (i + 1);  j < length; j++) {
      if(target == array[i] + array[j]) found.push([array[i], array[j]]);
    }
  }

  return found;
}

const pairSumBool = (array: Array<number>, target: number): boolean => {
  const length: number = array.length;
  
  for(let i = 0; i < length; i++) {
    for(let j = (i + 1);  j < length; j++) {
      if(target == array[i] + array[j]) return true;
    }
  }

  return false;
}

const array: Array<number> = [2, 7, -3, 1, 6, -2, 3, 10, 27, 8, 1, 10, 11, 4, 5];
const target: number = 9;
const value: boolean = pairSumBool(array, target);

console.log(`return: ${value}`);

if(value) {
  console.log('explain:');
  console.log(pairSumExplain(array, target));
}