binary.js•991 B
var _curry1 = require('./internal/_curry1');
var nAry = require('./nAry');
/**
* Wraps a function of any arity (including nullary) in a function that accepts
* exactly 2 parameters. Any extraneous parameters will not be passed to the
* supplied function.
*
* @func
* @memberOf R
* @since v0.2.0
* @category Function
* @sig (* -> c) -> (a, b -> c)
* @param {Function} fn The function to wrap.
* @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
* arity 2.
* @example
*
* var takesThreeArgs = function(a, b, c) {
* return [a, b, c];
* };
* takesThreeArgs.length; //=> 3
* takesThreeArgs(1, 2, 3); //=> [1, 2, 3]
*
* var takesTwoArgs = R.binary(takesThreeArgs);
* takesTwoArgs.length; //=> 2
* // Only 2 arguments are passed to the wrapped function
* takesTwoArgs(1, 2, 3); //=> [1, 2, undefined]
*/
module.exports = _curry1(function binary(fn) {
return nAry(2, fn);
});