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Expose a length property for curried functions #477

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Merged
dalefrancis88 merged 2 commits into from
May 26, 2020
Merged

Expose a length property for curried functions #477

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d29255f
Expose a length property for curried functions
JamieDixon May 24, 2020
0b7c7d7
Merge branch 'master' into curried-expose-length
dalefrancis88 May 26, 2020
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6 changes: 6 additions & 0 deletions src/core/curry.js
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,12 @@ function curry(fn) {
value: true
})

Object.defineProperty(curried, 'length', {
enumerable: false,
writable: false,
value: fn.length
})

return curried
}

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8 changes: 8 additions & 0 deletions src/core/curry.spec.js
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Expand Up @@ -78,3 +78,11 @@ test('curry on a curried function', t => {

t.end()
})

test('curried function with arity exposed', t => {
const fn = (a, b) => a + b
const curried = curry(fn)
t.equal(curried.length, fn.length, 'returns the same arity as its uncurried counterpart')

t.end()
})