Use the following function to find the maximum value of an array of numbers in JavaScript.

```
function findMaximum(array) {
let max = array[0];
for (let i = 1; i < array.length; i++) {
if (array[i] > max) {
max = array[i];
}
}
return max;
}
```

Alternatively, you can also use the unpack operator to unpack the array and use the Math.max() function to return the maximum value.

```
function findMaximum(array) {
return Math.max(...array);
}
```

You can run this function like this:

```
let array = [3,40,20,1,10];
console.log(findMaximum(array)); // Prints "40".
```

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