_createCurry.js (1447B)
1 var apply = require('./_apply'), 2 createCtor = require('./_createCtor'), 3 createHybrid = require('./_createHybrid'), 4 createRecurry = require('./_createRecurry'), 5 getHolder = require('./_getHolder'), 6 replaceHolders = require('./_replaceHolders'), 7 root = require('./_root'); 8 9 /** 10 * Creates a function that wraps `func` to enable currying. 11 * 12 * @private 13 * @param {Function} func The function to wrap. 14 * @param {number} bitmask The bitmask flags. See `createWrap` for more details. 15 * @param {number} arity The arity of `func`. 16 * @returns {Function} Returns the new wrapped function. 17 */ 18 function createCurry(func, bitmask, arity) { 19 var Ctor = createCtor(func); 20 21 function wrapper() { 22 var length = arguments.length, 23 args = Array(length), 24 index = length, 25 placeholder = getHolder(wrapper); 26 27 while (index--) { 28 args[index] = arguments[index]; 29 } 30 var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder) 31 ? [] 32 : replaceHolders(args, placeholder); 33 34 length -= holders.length; 35 if (length < arity) { 36 return createRecurry( 37 func, bitmask, createHybrid, wrapper.placeholder, undefined, 38 args, holders, undefined, undefined, arity - length); 39 } 40 var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func; 41 return apply(fn, this, args); 42 } 43 return wrapper; 44 } 45 46 module.exports = createCurry;