const numbers = [2, 4, 5, 2, 3, 5, 1, 2, 4];
I need to create the function indexOfRepeatedValue (array). Use numbers that are stored in the variable numbers.
I should create a variable firstIndex in this function. In the for loop, check which number repeats first and assign its index to firstIndex. Then write this variable to the console - outside of the for loop.
I came up with this idea It doesn't work at all. I'm lost, some piece of advice?
const numbers = [2, 4, 5, 2, 3, 5, 1, 2, 4];
function indexOfRepeatedValue(array) {
let firstIndex;
for (let i = 0; i < array.length; i++)
if (firstIndex.indexOf(array[i]) === -1 && array[i] !== '');
firstIndex.push(array[i]);
return firstIndex;
}
console.log(
indexOfRepeatedValue(numbers)
)