Condense arrays with reduce1

1

Tell us what’s happening:

Your code so far

var array = [4,5,6,7,8];
var singleVal = 0;

 singleVal = array.reduce(function(previousVal, currentVal) {
  return previousVal - currentVal;
}, 0);

// Only change code below this line.

singleVal = array;

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/condense-arrays-with-reduce

2

Tell us what’s happening:

Your code so far

var array = [4,5,6,7,8];
var singleVal;

singleVal = array.reduce(function(acc, curr ){
  return acc + curr;
});

singleVal = array.reduce(array[0],array[8]);

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36.

Link to the challenge:

4

I am failing to solve this challenge, Please help me.