Last challenge in basic JS

JavaScript
1

Tell us what’s happening:

Ended up blocking myself, i’m stuck,don’t know how to resolve this challenge

Your code so far


function rangeOfNumbers(startNum, endNum) {
if(endnum - startNum === 0){
  var range = [];
  range.push(startNum);
  return range;
}else{
  range = rangeOfNumbers(startNum, endNum - 1);
  range.push(endNum);
  return range
}
};

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0.

Challenge: Use Recursion to Create a Range of Numbers

Link to the challenge:

2

What problems are you having? What else have you tried?

3

in the tests, it doesn’ t return an array, neither any of the expected numbers

4

If you look at your console, you’ll probably see something like ReferenceError: endnum is not defined. Does that help?

5

whats your letter casings

6

/ running tests Your function should return an array.

rangeOfNumbers(1, 5)

should return

[1, 2, 3, 4, 5]

.

rangeOfNumbers(6, 9)

should return

[6, 7, 8, 9]

.

rangeOfNumbers(4, 4)

should return

[4]

. // tests completed
there is no reference error in the console, only this

7

screenshot
screenshot1475×997 50.5 KB

As the console says, you referencing an undefined variable: endnum.

1 Like
8

sorry, i feel so dumb.

9

I suck at recursion.
But I took it step by step. Adding “features” to the function and console out after each step. Maybe it helps understanding by watching the commented out code I wrote, and seeing my “progress” to the final solution:

  // function some(x) {
    //     if(x === 0) {
    //         return;
    //     }
    //     some(x - 1);
    //     console.log(x);

    // }
    // some(5);

    // function some(start, x) {
    //     if(x === start) {
    //         console.log(x)
    //         return;
    //     }
    //     some(start, x - 1);
    //     console.log(x);

    // }

    // some(2, 5);
    // let array = [];
    // function some(start, x) {  
    //     if(x === start) {
    //         // console.log(x);
    //         array.push(x);
    //         return;
    //     }
    //     some(start, x - 1);
    //     // console.log(x);
    //     array.push(x);
    // }

    // some(2,5);
    // console.log(array);

    // let array = [];
    // function some(array, start, x) {  
    //     if(x === start) {
    //         // console.log(x);
    //         array.push(x);
    //         return;
    //     }
    //     some(array, start, x - 1);
    //     // console.log(x);
    //     array.push(x);
    // }

    // some(array, 2, 5);
    // console.log(array);

    function some(start, x) {  
        if(x === start) {
            // console.log(x);
            let array = []
            array.push(x);
            return array;
        }
        let array = some(start, x - 1);
        // console.log(x);
        array.push(x);
        return array;
    }

    let array = some(2, 2);
    console.log(array);