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curry.js
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curry.js
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var R = require('../source/index.js');
var eq = require('./shared/eq.js');
var fc = require('fast-check');
describe('curry', function() {
it('curries a single value', function() {
var f = R.curry(function(a, b, c, d) {return (a + b * c) / d;}); // f(12, 3, 6, 2) == 15
var g = f(12);
eq(g(3, 6, 2), 15);
});
it('curries multiple values', function() {
var f = R.curry(function(a, b, c, d) {return (a + b * c) / d;}); // f(12, 3, 6, 2) == 15
var g = f(12, 3);
eq(g(6, 2), 15);
var h = f(12, 3, 6);
eq(h(2), 15);
});
it('allows further currying of a curried function', function() {
var f = R.curry(function(a, b, c, d) {return (a + b * c) / d;}); // f(12, 3, 6, 2) == 15
var g = f(12);
eq(g(3, 6, 2), 15);
var h = g(3);
eq(h(6, 2), 15);
eq(g(3, 6)(2), 15);
});
it('properly reports the length of the curried function', function() {
var f = R.curry(function(a, b, c, d) {return (a + b * c) / d;});
eq(f.length, 4);
var g = f(12);
eq(g.length, 3);
var h = g(3);
eq(h.length, 2);
eq(g(3, 6).length, 1);
});
it('preserves context', function() {
var ctx = {x: 10};
var f = function(a, b) { return a + b * this.x; };
var g = R.curry(f);
eq(g.call(ctx, 2, 4), 42);
eq(g.call(ctx, 2).call(ctx, 4), 42);
});
it('supports R.__ placeholder', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.curry(f);
var _ = R.__;
eq(g(1)(2)(3), [1, 2, 3]);
eq(g(1)(2, 3), [1, 2, 3]);
eq(g(1, 2)(3), [1, 2, 3]);
eq(g(1, 2, 3), [1, 2, 3]);
eq(g(_, 2, 3)(1), [1, 2, 3]);
eq(g(1, _, 3)(2), [1, 2, 3]);
eq(g(1, 2, _)(3), [1, 2, 3]);
eq(g(1, _, _)(2)(3), [1, 2, 3]);
eq(g(_, 2, _)(1)(3), [1, 2, 3]);
eq(g(_, _, 3)(1)(2), [1, 2, 3]);
eq(g(1, _, _)(2, 3), [1, 2, 3]);
eq(g(_, 2, _)(1, 3), [1, 2, 3]);
eq(g(_, _, 3)(1, 2), [1, 2, 3]);
eq(g(1, _, _)(_, 3)(2), [1, 2, 3]);
eq(g(_, 2, _)(_, 3)(1), [1, 2, 3]);
eq(g(_, _, 3)(_, 2)(1), [1, 2, 3]);
eq(g(_, _, _)(_, _)(_)(1, 2, 3), [1, 2, 3]);
eq(g(_, _, _)(1, _, _)(_, _)(2, _)(_)(3), [1, 2, 3]);
});
it('supports @@functional/placeholder', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.curry(f);
var _ = R.__;
eq(g(1)(2)(3), [1, 2, 3]);
eq(g(1)(2, 3), [1, 2, 3]);
eq(g(1, 2)(3), [1, 2, 3]);
eq(g(1, 2, 3), [1, 2, 3]);
eq(g(_, 2, 3)(1), [1, 2, 3]);
eq(g(1, _, 3)(2), [1, 2, 3]);
eq(g(1, 2, _)(3), [1, 2, 3]);
eq(g(1, _, _)(2)(3), [1, 2, 3]);
eq(g(_, 2, _)(1)(3), [1, 2, 3]);
eq(g(_, _, 3)(1)(2), [1, 2, 3]);
eq(g(1, _, _)(2, 3), [1, 2, 3]);
eq(g(_, 2, _)(1, 3), [1, 2, 3]);
eq(g(_, _, 3)(1, 2), [1, 2, 3]);
eq(g(1, _, _)(_, 3)(2), [1, 2, 3]);
eq(g(_, 2, _)(_, 3)(1), [1, 2, 3]);
eq(g(_, _, 3)(_, 2)(1), [1, 2, 3]);
eq(g(_, _, _)(_, _)(_)(1, 2, 3), [1, 2, 3]);
eq(g(_, _, _)(1, _, _)(_, _)(2, _)(_)(3), [1, 2, 3]);
});
it('forwards extra arguments', function() {
var f = function(a, b, c) {
void c;
return Array.prototype.slice.call(arguments);
};
var g = R.curry(f);
eq(g(1, 2, 3), [1, 2, 3]);
eq(g(1, 2, 3, 4), [1, 2, 3, 4]);
eq(g(1, 2)(3, 4), [1, 2, 3, 4]);
eq(g(1)(2, 3, 4), [1, 2, 3, 4]);
eq(g(1)(2)(3, 4), [1, 2, 3, 4]);
});
it('handles arguments beyond function arity when called with placeholder', function() {
var f = function(a, b, c) { return [a, b, c]; };
var g = R.curry(f);
var _ = R.__;
eq(g(1)(_, _, _)(2, _, _)(3)(4), [1, 2, 3]);
eq(g(_, 2, 3, 4)(1), [1, 2, 3]);
eq(g(1, 2, 3, _)(4), [1, 2, 3]);
eq(g(1)(_, 3, 4)(2), [1, 2, 3]);
eq(g(_)(_, 2, 3, 4)(1), [1, 2, 3]);
eq(g(_)(_, 2, _, 4, 5)(_, 3, 4)(1), [1, 2, 3]);
eq(g(_, _, _)(1, _, _)(_, _)(2, _)(_)(3), [1, 2, 3]);
eq(g(_)(_, 2, _, 4, 5)(1, 3), [1, 2, 3]);
});
it('passes along all arguments from previous calls including placeholder', function() {
var f = function() { return [...arguments]; };
var g = R.curry(f);
var _ = R.__;
eq(g(_)(_, 2, _, 4, 5)(1, 3), [1, 2, 3, 4, 5]);
eq(g(_, 2, 3, 4)(_, 5, 6)(_, 7, 8, 9)(1, 10), [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
eq(g(1), [1]);
eq(g(), []);
});
});
describe('curry properties', function() {
it('curries multiple values', function() {
fc.assert(fc.property(fc.func(fc.anything()), fc.anything(), fc.anything(), fc.anything(), fc.anything(), function(f, a, b, c, d) {
var f4 = function(a, b, c, d) {
return f(a, b, c, d);
};
var g = R.curry(f4);
return R.all(R.equals(f4(a, b, c, d)), [
g(a, b, c, d),
g(a)(b)(c)(d),
g(a)(b, c, d),
g(a, b)(c, d),
g(a, b, c)(d)
]);
}));
});
it('curries with placeholder', function() {
fc.assert(fc.property(fc.func(fc.anything()), fc.anything(), fc.anything(), fc.anything(), function(f, a, b, c) {
var _ = R.__;
var f3 = function(a, b, c) {
return f(a, b, c);
};
var g = R.curry(f3);
return R.all(R.equals(f3(a, b, c)), [
g(_, _, c)(a, b),
g(a, _, c)(b),
g(_, b, c)(a),
g(a, _, _)(_, c)(b),
g(a, b, _)(c)
]);
}));
});
});