123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960
var assert = require('assert');
var R = require('../source');var eq = require('./shared/eq');

describe('pipe', function() {
  it('is a variadic function', function() {    eq(typeof R.pipe, 'function');    eq(R.pipe.length, 0);  });
  it('performs left-to-right function composition', function() {    //  f :: (String, Number?) -> ([Number] -> [Number])    var f = R.pipe(parseInt, R.multiply, R.map);
    eq(f.length, 2);    eq(f('10')([1, 2, 3]), [10, 20, 30]);    eq(f('10', 2)([1, 2, 3]), [2, 4, 6]);  });
  it('passes context to functions', function() {    function x(val) {      return this.x * val;    }    function y(val) {      return this.y * val;    }    function z(val) {      return this.z * val;    }    var context = {      a: R.pipe(x, y, z),      x: 4,      y: 2,      z: 1    };    eq(context.a(5), 40);  });
  it('throws if given no arguments', function() {    assert.throws(      function() { R.pipe(); },      function(err) {        return err.constructor === Error &&               err.message === 'pipe requires at least one argument';      }    );  });
  it('can be applied to one argument', function() {    var f = function(a, b, c) { return [a, b, c]; };    var g = R.pipe(f);    eq(g.length, 3);    eq(g(1, 2, 3), [1, 2, 3]);  });
});