comparator.js•740 B
var _curry1 = require('./internal/_curry1');
/**
* Makes a comparator function out of a function that reports whether the first
* element is less than the second.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a, b -> Boolean) -> (a, b -> Number)
* @param {Function} pred A predicate function of arity two.
* @return {Function} A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`.
* @example
*
* var cmp = R.comparator((a, b) => a.age < b.age);
* var people = [
* // ...
* ];
* R.sort(cmp, people);
*/
module.exports = _curry1(function comparator(pred) {
return function(a, b) {
return pred(a, b) ? -1 : pred(b, a) ? 1 : 0;
};
});