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report correct arity for curried functions

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fixes #31
This commit is contained in:
Andy Brown 2015-08-21 09:09:18 -07:00
parent dea78333ff
commit 932da9f7d5
2 changed files with 24 additions and 4 deletions
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8
lib/util/curry.js
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@ -13,7 +13,7 @@ function countArguments(args, max) {
} }
export function curry1(fn) { export function curry1(fn) {
return function curried(a, b, c) { return function curried(a, ...[b, c]) {
const n = countArguments(arguments); const n = countArguments(arguments);
if (n >= 1) return fn(a, b, c); if (n >= 1) return fn(a, b, c);
@ -22,7 +22,7 @@ export function curry1(fn) {
} }
export function curry2(fn) { export function curry2(fn) {
return function curried(a, b, c, d) { return function curried(a, b, ...[c, d]) {
const n = countArguments(arguments, 2); const n = countArguments(arguments, 2);
if (b === _ || c === _ || d === _) { if (b === _ || c === _ || d === _) {
@ -40,7 +40,7 @@ export function curry2(fn) {
} }
export function curry3(fn) { export function curry3(fn) {
return function curried(a, b, c, d, e) { return function curried(a, b, c, ...[d, e]) {
const n = countArguments(arguments, 3); const n = countArguments(arguments, 3);
if (c === _ || d === _ || e === _) { if (c === _ || d === _ || e === _) {
@ -68,7 +68,7 @@ export function curry3(fn) {
} }
export function curry4(fn) { export function curry4(fn) {
return function curried(a, b, c, d, e, f) { return function curried(a, b, c, d, ...[e, f]) {
const n = countArguments(arguments, 4); const n = countArguments(arguments, 4);
if (d === _ || e === _ || f === _) { if (d === _ || e === _ || f === _) {

20
test/util/curry-spec.js
View File

@ -12,6 +12,11 @@ describe('curry1', () => {
const curried = curry1((a, b, c) => [a, b, c]); const curried = curry1((a, b, c) => [a, b, c]);
expect(curried(1, 2, 3, 4)).to.eql([1, 2, 3]); expect(curried(1, 2, 3, 4)).to.eql([1, 2, 3]);
}); });
it('returns a fn with arity of 1', () => {
const curried = curry1((a, b, c) => [a, b, c]);
expect(curried).to.have.length(1);
});
}); });
describe('curry2', () => { describe('curry2', () => {
@ -31,6 +36,11 @@ describe('curry2', () => {
const curried = curry2((a, b, c, d) => [a, b, c, d]); const curried = curry2((a, b, c, d) => [a, b, c, d]);
expect(curried(_, 2)(1, 3, 4)).to.eql([1, 2, 3, 4]); expect(curried(_, 2)(1, 3, 4)).to.eql([1, 2, 3, 4]);
}); });
it('returns a fn with arity of 2', () => {
const curried = curry2((a, b, c, d) => [a, b, c, d]);
expect(curried).to.have.length(2);
});
}); });
describe('curry3', () => { describe('curry3', () => {
@ -53,6 +63,11 @@ describe('curry3', () => {
expect(curried(_, 2, 3)('c', 4, 5)).to.eql(['c', 2, 3, 4, 5]); expect(curried(_, 2, 3)('c', 4, 5)).to.eql(['c', 2, 3, 4, 5]);
expect(curried(_, _, 3)('d', 2, 4, 5)).to.eql(['d', 2, 3, 4, 5]); expect(curried(_, _, 3)('d', 2, 4, 5)).to.eql(['d', 2, 3, 4, 5]);
}); });
it('returns a fn with arity of 3', () => {
const curried = curry3((a, b, c, d, e) => [a, b, c, d, e]);
expect(curried).to.have.length(3);
});
}); });
describe('curry4', () => { describe('curry4', () => {
@ -87,4 +102,9 @@ describe('curry4', () => {
expect(curried(_, _, _, 4)('k', 2, 3, 5, 6)).to.eql(['k', 2, 3, 4, 5, 6]); expect(curried(_, _, _, 4)('k', 2, 3, 5, 6)).to.eql(['k', 2, 3, 4, 5, 6]);
}); });
it('returns a fn with arity of 4', () => {
const curried = curry4((a, b, c, d, e, f) => [a, b, c, d, e, f]);
expect(curried).to.have.length(4);
});
}); });