const { match, when } = require('matchpattern')
const response = { status: 200, body: 'hello world' }
const result = match(response, [
when `{ status: 200, body: contents }`(
({ contents }) => contents
),
when `{ status: httpStatus, body: _ }` (
({ httpStatus }) => { throw new Error(`HTTP ${httpStatus}`) }
),
when `_` (
() => { throw new Error('Malformed response object') }
),
])
console.log(result)
'response' is matched with first case, cause 'status' property is equal to number 200. 'contents' just extracts 'body' property to case resolve function.
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