Created
February 3, 2018 08:20
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Async/Await with Generators... the ultimate in decoupling!
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import test from 'tape'; | |
const query = async () => ({ value: 'Z' }); | |
const call = ( fn, ...params ) => ({ fn, params }); | |
const create = function *( formId ) { | |
const form = yield call( query, 'SELECT', formId ); | |
return form; | |
}; | |
const connect = ( generator ) => async ( ...input ) => { | |
const iter = generator( ...input ); | |
let step = iter.next(); | |
while ( !step.done ) { | |
let { fn, params } = step.value; | |
let result = await fn( ...params ); | |
step = iter.next( result ); | |
} | |
return step.value; | |
} | |
test( "Async/await with generators...", async assert => { | |
const iter = create( 'X' ); | |
const step1 = iter.next(); | |
assert.deepEquals( step1.value, { fn: query, params: ['SELECT', 'X'] }, 'Should emit a call, with the correct function and parameters.' ); | |
const step2 = iter.next( 'Y' ); | |
assert.equals( step2.value, 'Y', 'Should yield the loaded form.' ); | |
const result = await connect( create )( 'X' ); | |
assert.deepEquals( result, { value: 'Z' }, 'Should return the correct result when connected.' ); | |
assert.end(); | |
}); |
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