allPass.js•1.27 kB
var _curry1 = require('./internal/_curry1');
var curryN = require('./curryN');
var max = require('./max');
var pluck = require('./pluck');
var reduce = require('./reduce');
/**
* Takes a list of predicates and returns a predicate that returns true for a
* given list of arguments if every one of the provided predicates is satisfied
* by those arguments.
*
* The function returned is a curried function whose arity matches that of the
* highest-arity predicate.
*
* @func
* @memberOf R
* @since v0.9.0
* @category Logic
* @sig [(*... -> Boolean)] -> (*... -> Boolean)
* @param {Array} preds
* @return {Function}
* @see R.anyPass
* @example
*
* var isQueen = R.propEq('rank', 'Q');
* var isSpade = R.propEq('suit', '♠︎');
* var isQueenOfSpades = R.allPass([isQueen, isSpade]);
*
* isQueenOfSpades({rank: 'Q', suit: '♣︎'}); //=> false
* isQueenOfSpades({rank: 'Q', suit: '♠︎'}); //=> true
*/
module.exports = _curry1(function allPass(preds) {
return curryN(reduce(max, 0, pluck('length', preds)), function() {
var idx = 0;
var len = preds.length;
while (idx < len) {
if (!preds[idx].apply(this, arguments)) {
return false;
}
idx += 1;
}
return true;
});
});