Collections: support keys in crossJoin(...$arrays) method

[vanodevium]

Improve this method or add the brand new method (ex. crossJoinKeys) for support combinations with keys.

Example in php:

collect(['numbers' => [1, 2, 3], 'symbols' => ['!', '@', '#'], 'letters' => ['a', 'b', 'c']])->crossJoinKeys();

---

Example in JSON formatting

Input array:

{
    "numbers": [
        1,
        2,
        3
    ],
    "symbols": [
        "!",
        "@",
        "#"
    ],
    "letters": [
        "a",
        "b",
        "c"
    ]
}

Expected result:

[
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 1,
        "symbols": "#",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 2,
        "symbols": "#",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "!",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "@",
        "letters": "c"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "a"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "b"
    },
    {
        "numbers": 3,
        "symbols": "#",
        "letters": "c"
    }
]

[mvvtf]

Just what I need ATM, a shame it wasn't implemented...

ig it shouldn't be to hard to do, don't you want to take a shot at it yourself? would make a good PR imho!

[henzeb]

Why you don't do it?

A solution however would be:

collect($input['numbers'])
    ->crossJoin($input['symbols'], $input['letters'])
    ->map(function ($item) {
        return [
            'numbers' => $item[0],
            'symbols' => $item[1],
            'letters' => $item[2]
        ];
    })
    ->values()
    ->all();

[mvvtf]

Honestly I really want to take a shot at it myself so I might actually do it!

For those kind of small, more like quality of life, improvements i've been told that it's good training for the one comming up with the idea to do it, that's why.

Edit: just saw you edit with the code, that's exactly what i've done :) next step is to put it in a macro

Simple, but would still be nice to have it backed in.

[henzeb]

Sure, it is a good thing, but this thread is 2 years old.