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reduce: Require initialValue in functional interface.

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David Braun 2017-11-28 11:39:37 -05:00
parent 366249f84f
commit 1fc2308f08
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2 changed files with 8 additions and 1 deletions
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7
lib/index.js
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@ -407,9 +407,14 @@ const methods = Object.keys(channel).filter(
method => typeof channel[method] === `function`
);
const arities = {
reduce: 2,
slice: 2
};
methods.forEach(method => {
const bound = function(...args) {
const arity = method === `slice` ? 2 : channel[method].length;
const arity = arities[method] || channel[method].length;
return args.length > arity
? args[arity][method](...args.slice(0, arity))

2
test/index.js
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@ -176,6 +176,8 @@ describe(`functional interface`, async function() {
});
it(`double argument application`, async function() {
assert.equal(await Channel.reduce(Math.max, 10, Channel.of(0, 1, 2)), 10);
assert.deepEqual(
await Channel.slice(1, 4)(Channel.of(0, 1, 2, 3, 4)).values(),
[1, 2, 3]