web3.eth.abi.decodeParameters returns array for one parameter and object for multiple

[Velenir]

Description

web3.eth.abi.decodeParameters returns an Object when decoding multiple parameters and an Array when decoding one parameter. In version beta.37 both cases returned Result object

Expected behavior

Like it was in version beta.37:

> const abi = require('web3-eth-abi')
> const encoded = abi.encodeParameters(['string', 'string'], ['Hello', 'World!']);
> encoded
'0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006576f726c64210000000000000000000000000000000000000000000000000000'
> let decoded = abi.decodeParameters(['string', 'string'], encoded);
> decoded
Result { '0': 'Hello', '1': 'World!', __length__: 2 }
> decoded.constructor.name
'Result'
> decoded = abi.decodeParameters(['string'], encoded);
Result { '0': 'Hello', __length__: 1 }
> decoded.constructor.name
'Result'
> 

Actual behavior

> const ABI = require('web3-eth-abi')
> const abi = new ABI.AbiCoder()
> const encoded = abi.encodeParameters(['string', 'string'], ['Hello', 'World!']);
> encoded
'0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000548656c6c6f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006576f726c64210000000000000000000000000000000000000000000000000000'
> let decoded = abi.decodeParameters(['string', 'string'], encoded);
> decoded
{ '0': 'Hello', '1': 'World!' }
> decoded.constructor.name
'Object'
> decoded = abi.decodeParameters(['string'], encoded);
[ 'Hello' ]
> decoded.constructor.name
'Array'

Is it intentional that decoding one parameter returns an array, and multiple -- an object? Would be nice to have decodeParameters return the same in both cases.

Gists

Versions

• web3.js: 1.0.0-beta.55
• nodejs: v10.15.3
• browser: node console
• ethereum node:

[nivida]

Thanks for figuring this out! I will fix and release it asap.

[github-actions]

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