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feat(compose): optimize one function case #1701

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merged 3 commits into from
May 8, 2016
Merged

feat(compose): optimize one function case #1701

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0c088fe
feat(compose): optimize one function case
julien-f May 7, 2016
dc1d766
style(compose): do not use a variable for funcs.length
julien-f May 8, 2016
5f55d8f
test(compose): add test for a single param
julien-f May 8, 2016
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15 changes: 10 additions & 5 deletions src/compose.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,11 +10,16 @@
*/

export default function compose(...funcs) {
if (funcs.length === 0) {
const { length } = funcs
if (!length) {
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I'd remove this variable extraction. You don't use it below. It's an unnecessary optimization.

return arg => arg
} else {
const last = funcs[funcs.length - 1]
const rest = funcs.slice(0, -1)
return (...args) => rest.reduceRight((composed, f) => f(composed), last(...args))
}

if (length === 1) {
return funcs[0]
}

const last = funcs[funcs.length - 1]
const rest = funcs.slice(0, -1)
return (...args) => rest.reduceRight((composed, f) => f(composed), last(...args))
}