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Contents
var arrayEvery = require('../internal/arrayEvery'),
isFunction = require('../lang/isFunction');
/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';
/**
* This method is like `_.flow` except that it creates a function that
* invokes the provided functions from right to left.
*
* @static
* @memberOf _
* @alias backflow, compose
* @category Function
* @param {...Function} [funcs] Functions to invoke.
* @returns {Function} Returns the new function.
* @example
*
* function add(x, y) {
* return x + y;
* }
*
* function square(n) {
* return n * n;
* }
*
* var addSquare = _.flowRight(square, add);
* addSquare(1, 2);
* // => 9
*/
function flowRight() {
var funcs = arguments,
fromIndex = funcs.length - 1;
if (fromIndex < 0) {
return function() { return arguments[0]; };
}
if (!arrayEvery(funcs, isFunction)) {
throw new TypeError(FUNC_ERROR_TEXT);
}
return function() {
var index = fromIndex,
result = funcs[index].apply(this, arguments);
while (index--) {
result = funcs[index].call(this, result);
}
return result;
};
}
module.exports = flowRight;
Version data entries
14 entries across 7 versions & 1 rubygems