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x/ramda/internal/_dispatchable.js

:ram: Practical functional Javascript
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import _isArray from './_isArray';import _isTransformer from './_isTransformer';

/** * Returns a function that dispatches with different strategies based on the * object in list position (last argument). If it is an array, executes [fn]. * Otherwise, if it has a function with one of the given method names, it will * execute that function (functor case). Otherwise, if it is a transformer, * uses transducer [xf] to return a new transformer (transducer case). * Otherwise, it will default to executing [fn]. * * @private * @param {Array} methodNames properties to check for a custom implementation * @param {Function} xf transducer to initialize if object is transformer * @param {Function} fn default ramda implementation * @return {Function} A function that dispatches on object in list position */export default function _dispatchable(methodNames, xf, fn) { return function() { if (arguments.length === 0) { return fn(); } var args = Array.prototype.slice.call(arguments, 0); var obj = args.pop(); if (!_isArray(obj)) { var idx = 0; while (idx < methodNames.length) { if (typeof obj[methodNames[idx]] === 'function') { return obj[methodNames[idx]].apply(obj, args); } idx += 1; } if (_isTransformer(obj)) { var transducer = xf.apply(null, args); return transducer(obj); } } return fn.apply(this, arguments); };}