I know this may be too simple for most people here, but I'm starting to learn Javascript and I'm stuck in this - apparently - very simple challenge: I'm supposed to write a function that counts the number of negative values in an array. This is what I wrote:

function myFunction(a) {
let n = 0;
for (let x = 0; x =< a.length; x++) {
 if (a[x] < 0) {n++}; 
 else {n = n};

return n
}

I don't understand what's wrong with it but tests keep coming wrong, I have tried changing it all over but nothing works. Any ideas as to what I did wrong?