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Remove filtering inside compose #2167

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merged 1 commit into from
Dec 30, 2016
Merged

Remove filtering inside compose #2167

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2 changes: 0 additions & 2 deletions src/compose.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,6 @@
*/

export default function compose(...funcs) {
funcs = funcs.filter(func => typeof func === 'function')

if (funcs.length === 0) {
return arg => arg
}
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15 changes: 7 additions & 8 deletions test/compose.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,15 +21,15 @@ describe('Utils', () => {
expect(compose(c, a, b)(final)('')).toBe('cab')
})

it('composes only functions', () => {
it('throws at runtime if argument is not a function', () => {
const square = x => x * x
const add = (x, y) => x + y
expect(compose(square, add, false)(1, 2)).toBe(9)
expect(compose(square, add, undefined)(1, 2)).toBe(9)
expect(compose(square, add, true)(1, 2)).toBe(9)
expect(compose(square, add, NaN)(1, 2)).toBe(9)
expect(compose(square, add, '42')(1, 2)).toBe(9)

expect(() => compose(square, add, false)(1, 2)).toThrow()
expect(() => compose(square, add, undefined)(1, 2)).toThrow()
expect(() => compose(square, add, true)(1, 2)).toThrow()
expect(() => compose(square, add, NaN)(1, 2)).toThrow()
expect(() => compose(square, add, '42')(1, 2)).toThrow()
})

it('can be seeded with multiple arguments', () => {
Expand All @@ -41,7 +41,6 @@ describe('Utils', () => {
it('returns the first given argument if given no functions', () => {
expect(compose()(1, 2)).toBe(1)
expect(compose()(3)).toBe(3)
expect(compose(false,4,'test')(3)).toBe(3)
expect(compose()()).toBe(undefined)
})

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