n-ary

v0.9.6

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Passing

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PUBLISHED

5 years ago

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982 B

Wraps a function of any arity (including nullary) in a function that accepts exactly `n` parameters.

Function

Utils

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nAry (

n:Number,

fn:Function

) : Function

Wraps a function of any arity (including nullary) in a function that accepts exactly n parameters. Any extraneous parameters will not be passed to the supplied function.

Example

const takesTwoArgs = (a, b) => [a, b];

     takesTwoArgs.length; //=> 2
     takesTwoArgs(1, 2); //=> [1, 2]

     const takesOneArg = R.nAry(1, takesTwoArgs);
     takesOneArg.length; //=> 1
     // Only `n` arguments are passed to the wrapped function
     takesOneArg(1, 2); //=> [1, undefined]

Arguments

n: Number

The desired arity of the new function.

fn: Function

The function to wrap.

Returns

Function

A new function wrapping `fn`. The new function is guaranteed to be of arity `n`.