arraySolution.js

/*Given two integers a and b, which can be positive or negative, find the sum of all the integers between and including them and return it. If the two numbers are equal return a or b.

Note: a and b are not ordered!

Examples (a, b) --> output (explanation)
(1, 0) --> 1 (1 + 0 = 1)
(1, 2) --> 3 (1 + 2 = 3)
(0, 1) --> 1 (0 + 1 = 1)
(1, 1) --> 1 (1 since both are same)
(-1, 0) --> -1 (-1 + 0 = -1)
(-1, 2) --> 2 (-1 + 0 + 1 + 2 = 2) */


function getSum( a,b ){
    if(a == b){
      return a
    }
    if(b>a){
        let array =[]
    for(let i = a ; i <=b ; i++){
     array.push(i)
    }
    return array.reduce((acc,c)=>acc+c,0)
    }else{
        let array =[]
    for(let i = b ; i <=a ; i++){
     array.push(i)
    }
  return array.reduce((acc,c)=>acc+c,0)
    }

  }