Finders Keepers lesson

JavaScript
1

Hey guys, what am I doing wrong here? I feel like it’s something with my function syntax but I am not sure, any help is appreciated, thanks :slight_smile:

  **Your code so far**


function findElement(arr, func) {
    let num = 0;
  function func() {
 for (let i = 0; i < arr.length; i++) {
if (arr[i] === func(num)) {
  return arr[i]
}
else {
  return undefined;
}
  }
 
}
  }



findElement([1, 2, 3, 4], num => num % 2 === 0);

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36

Challenge: Finders Keepers

Link to the challenge:

2

The first thing that stands out here is your findElement array takes a func argument which is the callback function - but then right below it, you redeclare the func as a new function.

3 
function findElement(arr, func) {

    let num = 0;

 for (let i = 0; i < arr.length; i++) {

if (arr[i] === func(num)) {

  return arr[i]

}

else {

  return undefined;

}

  }

  }

findElement([1, 2, 3, 4], num => num % 2 === 0);

tried like this too

4

could you explain your reasoning for this?

5

yes,
I have tried to invoke the parameter func, since its a function and the “true test”,
and if that specific array element passes the test, that return what I need. so
thats why arr[i] === func(num) ( i wasn’t sure how to do it )

6

Then how about you actually test the specific element?
Right now you are testing num, which is 0.

1 Like
7

arr[i] === func
so does this code test that specific element? cause I am not sure if it invokes the function parameter like this.

8

func is just the function. You need to call it with the correct argument.

1 Like
9

This is just a request, but if you’re going to share your code, please format it first. If you right click on the code editor there’s a dialog box that pops up and you can click “Format Document” to format it automatically.

Your code from the original post (the brackets are just totally random, there’s a decreasing indentation, it’s a mess…):

function findElement(arr, func) {
    let num = 0;
  function func() {
 for (let i = 0; i < arr.length; i++) {
if (arr[i] === func(num)) {
  return arr[i]
}
else {
  return undefined;
}
  }
 
}
  }

That same code after clicking “Format Document” ( you can actually see where the blocks of code start and end as their indentations line up):

function findElement(arr, func) {
  let num = 0;
  function func() {
    for (let i = 0; i < arr.length; i++) {
      if (arr[i] === func(num)) {
        return arr[i]
      }
      else {
        return undefined;
      }
    }

  }
}
2 Likes
10

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