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x/ramda/source/pipeWith.js

:ram: Practical functional Javascript
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import _arity from './internal/_arity.js';import _curry2 from './internal/_curry2.js';import head from './head.js';import _reduce from './internal/_reduce.js';import tail from './tail.js';import identity from './identity.js';

/** * Performs left-to-right function composition using transforming function. The first function may have * any arity; the remaining functions must be unary. * * **Note:** The result of pipeWith is not automatically curried. Transforming function is not used on the * first argument. * * @func * @memberOf R * @since v0.26.0 * @category Function * @sig ((* -> *), [((a, b, ..., n) -> o), (o -> p), ..., (x -> y), (y -> z)]) -> ((a, b, ..., n) -> z) * @param {Function} transformer The transforming function * @param {Array} functions The functions to pipe * @return {Function} * @see R.composeWith, R.pipe * @example * * const pipeWhileNotNil = R.pipeWith((f, res) => R.isNil(res) ? res : f(res)); * const f = pipeWhileNotNil([Math.pow, R.negate, R.inc]) * * f(3, 4); // -(3^4) + 1 * @symb R.pipeWith(f)([g, h, i])(...args) = f(i, f(h, g(...args))) */var pipeWith = _curry2(function pipeWith(xf, list) { if (list.length <= 0) { return identity; }
var headList = head(list); var tailList = tail(list);
return _arity(headList.length, function() { return _reduce( function(result, f) { return xf.call(this, f, result); }, headList.apply(this, arguments), tailList ); });});export default pipeWith;