I am having a hard time understanding what the ‘Build a First Element Finder’ means by using a test function. I should have two parameters for the findElement() function, one being an array and another being a function. I do not declare the function in my own code since the test cases will pass it on their end. I am confused about whether I should be calling the function from within the one I declared and assigning its return value to a variable. The prompt is rather vague and I tried to read over the test cases, but they all measure vastly different operations which leaves me confused. The main idea is a “truth test”. Basically return the first item in the array that passes that “truth test”.
Also, I was wondering since a function’s returned value is being assigned to a variable such as funcVal, would it need closed parentheses when referencing that variable? I recently read over the module about closures which details memory and private variables. A variable being assigned a function’s returned value and whenever that variable is used it uses closed parentheses.
Your code so far
function findElement(arr, num) {
const funcVal = num();
for (element of arr) {
if (element === funcVal) {
return element;
}
}
// No return statement since default behavior returns 'undefined'.
}
Test Case Example:
2. findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }) should return 8.
Challenge Information:
Build a First Element Finder - Build a First Element Finder
A quick add–on to detail the revisions I made to my code.
function findElement(arr, num) {
let funcVal;
for (element of arr) {
funcVal = num(element);
if (funcVal === true) {
return element;
}
}
// No return statement since default behavior returns 'undefined'.
}
This still fails the test cases, but I suppose I’m thinking of it in a way where I pass the current element of the array to the function. It returns either true or false and I assign that return value to the funcVal variable. Afterwards, I see if it is equal to true and if it is I return that element. Otherwise the function returns undefined.
Yes, I believe I’m heading in the right direction…maybe. I added a comment not long after the initial post where I made the following changes.
function findElement(arr, num) {
let funcVal;
for (element of arr) {
funcVal = num(element);
if (funcVal === true) {
return element;
}
}
// No return statement since default behavior returns ‘undefined’.
}
However, I’m still encountering many failed test cases. In this revised code, I am passing an argument to that function which would be the current element being iterated over in the array.
Oh, that’s such a simple mistake…I keep making it actually. I didn’t define the variable in the for…of loop. I ran the console.log() and it said that element was undefined then I defined it (not trying to paint what the answer looks like as to not break any rules).
Thank you for bringing that to my attention, it works now!
