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mapkey​

mapkey(
    @llll ## llll (required)
    @key ## symbol (required)
    @func ## lambda function (required)
) -> llll

Modifies an existing llll key via a lambda function, with signature ($x, $llll -> $y). It assumes the llll consists of key-value pairs, and is wrapped at the top level, like so:

[
    [ '<key1>' <value1> ]
    [ '<key2>' <value2> ]
    ...
    [ '<keyN>' <valueN> ]
]

Arguments​

  • @llll [llll]: llll to modify. (required)
  • @key [symbol]: Name of llll key. (required)
  • @func [lambda function]: Lambda function. (required)

Output​

Modified llll [llll]

Usage​

$nums = [["one" 1] ["two" 2]];
$func = ($val -> $val :* 4);
$nums = $nums.mapkey("one", $func); ## re-assign to update
print($nums) ## [["one" 1 1 1 1] ["two" 2]]