more powerful array splicing:

[nmn]

Spider already supports:

numbers[3..6] = [-3, -4, -5, -6];

This should work even if the number of elements on the right don't watch. For example:

var arr = [0,1,2,3,4,5,6];
/// arr.length === 7;

arr[2...4] = [-2];
// arr === [0, 1, -2, 5, 6]
// arr.length === 5

[CryZe]

I would've expected this to just set those elements to -2, not actually remove them.

[alongubkin]

@CryZe I would've expected this to set those elements to -2 if the -2 wasn't in an array:

arr[2...4] = -2;

[Namek]

There's a difference between:

arr[2...4] = 0

and

arr[2...4] = [0];

that way both @nmn and @CryZe would be happy. @alongubkin I'm sorry, I don't feel your way in there.

[nmn]

Well, my proposal was straight from Swift. To be fair, the existing range splicing looked to be straight out of swift, so it felt completely obvious to me.

In swift:

var arr = [0,1,2,3,4,5,6,7,8,9]
arr[2...8] = [99]
// arr = [0, 1, 99, 9]

Also, you can shove in a bigger array instead:

var arr = [0, 1, 9];
arr[1..<2] = [1,2,3,4,5,6,7,8];
// arr =  [0,1,2,3,4,5,6,7,8,9];

In Swift: arr[2...5] = -2 throws an error.

This whole thing feels natural to me and kind of similar to spread operators in ES6 Arrays:

var arr1 = [2,3,4,5];
var arr2 = [0, 1, ...arr1, 6,7,8,9];
// arr =  [0,1,2,3,4,5,6,7,8,9];