@lang:unzip

Transpose an array of pairs into two separate arrays.

On-chain (@lang:unzip!): The lane argument defaults to 0 (@keys! is lane 0 and @values! lane 1), and an odd word count gives lane 0 the extra word.

Returns: array

Syntax

@lang:unzip(pairs lane?)

Arguments

Name	Type	Description
pairs	array	Array of [a, b] pairs
[lane]	number	Which lane to keep: 0 (first of each pair) or 1 (second)

See Also

• @zip — combine two arrays into pairs
• @keys, the named form of lane 0 over a record
• @values, the named form of lane 1 over a record

On-chain face (@unzip!)

Select one LANE of an interleaved word payload on-chain through unzipWords. Lane 0 keeps the first word of each pair, 1 the second; an odd word count gives lane 0 the extra word.

unzipWords returns ONE lane per call, so the two lanes are always two separate reads: there is no form that hands you both. The lane argument is optional and defaults to 0, which means @unzip!(x) is exactly @unzip!(x 0) and compiles to byte-identical calldata.

Because a bare @unzip!(x) does not say WHICH half you got, prefer the named forms when the payload is a record: @keys! is lane 0 and @values! is lane 1, both compiling to the same read as the corresponding @unzip! lane.

Examples

load lang

set $amm 0x44fA8E6f47987339850636F88629646662444217

assert @unzip!($amm::{reservePairs()(uint256[])} 0) == 0x1122

# the lane may be omitted, and then it is lane 0
assert @unzip!($amm::{reservePairs()(uint256[])}) == 0x1122

See Also

• assert, @zip!