"Boom, you failed to cut the wire"

This is more riddle than coding challenge, and apparently I am bad at riddles. Can someone give me a hint?

var wireCode = 1; // Find the wire.
var Bomb = {
CutTheWire: function(wireKey) {
if (wireKey = 1) {
return;
}
},
Explode: function() { return }
}
Bomb.CutTheWire(wireCode);

Can someone provide an example of what a test looks like for this kata? Even just how to test the call in the kata description.

Here's my code:

function once(fn) {
var executed = false;
return function(variable) {
if (!executed) {
executed = true;
fn(variable);
}
}
}

I've passed the kata. Just trying to understand the guts of the call stack.

This is the line that causes the error:
addWord(addWord(list, 'how are you'), 'goodbye');

So I'm guessing that because the nested call to addWord hasn't returned 'goodbye' cannot be appended.

Not so

My code passes all the test except for this one. It's a simple algorithm so I have no idea why it would fail for this one test.

Same here. Still hasn't been corrected

Passed all the test cases. But when I submit I get:
TypeError: Reduce of empty array with no initial value
at Array.reduce
at Array.sum
at Array.average
at Test.it
at array
at Test.describe

The code has passed through eslint with no problem. I'm not sure what they're getting at with this

How to round in order to get the expected results?