More cool stuff:
```javascript
const arr = [1, 2, 3];

// Easy push
arr[] = 4; // => arr[arr.length];

// Easy s(p)lice
arr[begin, end];,
arr[begin,]; // => arr[begin, arr.length];
arr[begin, end] = [1, 2, 3];
```

A terrible example (terrible because this should be done with WebGL
shaders):
```javascript
const image = [ /* Umbagajillion of RGBA pixels */ ];

function manipulate(rgba) {
  rgba[0] += 10;
  rgba[1] += 10;
  rgba[2] += 10;
}

for (let i = 0; i < image.length / 4; i++) {
  const begin = i * 4;
  const end = begin + 4;

  /*
    In case easy s(p)lice doesn't actually Array.p.slice
    and just creates a limited view of the array
    without breaking reference
    (image[begin, end] === image[begin, end])
  */
  manipulate(image[begin, end]);

  /*
    In case easy s(p)lice does Array.p.slice
    and creates a new array
    (image[begin, end] !== image[begin, end])
  */
  const pixel = image[begin, end];
  manipulate(pixel);
  image[begin, end] = pixel;
}
```
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More cool stuff:
```javascript
const arr = [1, 2, 3];

// Easy push
arr[] = 4; // => arr[arr.length];

// Easy s(p)lice
arr[begin, end];,
arr[begin,]; // => arr[begin, arr.length - 1];

arr[begin, end] = [1, 2, 3];
```

A terrible example (terrible because this should be done with WebGL
shaders):
```javascript
const image = [ /* Umbagajillion of RGBA pixels */ ];

function manipulate(rgba) {
  rgba[0] += 10;
  rgba[1] += 10;
  rgba[2] += 10;
}

for (let i = 0; i < image.length / 4; i++) {
  const begin = i * 4;
  const end = begin + 4;

  /*
    In case easy s(p)lice doesn't actually Array.p.slice
    and just creates a limited view of the array
    without breaking reference
    (image[begin, end] === image[begin, end])
  */
  manipulate(image[begin, end]);

  /*
    In case easy s(p)lice does Array.p.slice
    and creates a new array
    (image[begin, end] !== image[begin, end])
  */
  const pixel = image[begin, end];
  manipulate(pixel);
  image[begin, end] = pixel;
}
```

Edit: Fixed the typo @kdex pointed out. Thanks!