wip: code formatting nits continued

test/curry.spec.js

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+import lodashStable from 'lodash';
+import { slice, stubArray } from './utils';
+import curry from '../src/curry';
+import placeholder from '../src/placeholder';
+import bind from '../src/bind';
+import partial from '../src/partial';
+import partialRight from '../src/partialRight';
+
+describe('curry', () => {
+    function fn(a, b, c, d) {
+        return slice.call(arguments);
+    }
+
+    it('should curry based on the number of arguments given', () => {
+        const curried = curry(fn),
+            expected = [1, 2, 3, 4];
+
+        expect(curried(1)(2)(3)(4)).toEqual(expected);
+        expect(curried(1, 2)(3, 4)).toEqual(expected);
+        expect(curried(1, 2, 3, 4)).toEqual(expected);
+    });
+
+    it('should allow specifying `arity`', () => {
+        const curried = curry(fn, 3),
+            expected = [1, 2, 3];
+
+        expect(curried(1)(2, 3)).toEqual(expected);
+        expect(curried(1, 2)(3)).toEqual(expected);
+        expect(curried(1, 2, 3)).toEqual(expected);
+    });
+
+    it('should coerce `arity` to an integer', () => {
+        const values = ['0', 0.6, 'xyz'],
+            expected = lodashStable.map(values, stubArray);
+
+        const actual = lodashStable.map(values, (arity) => curry(fn, arity)());
+
+        expect(actual).toEqual(expected);
+        expect(curry(fn, '2')(1)(2), [1).toEqual(2]);
+    });
+
+    it('should support placeholders', () => {
+        const curried = curry(fn),
+            ph = curried.placeholder;
+
+        expect(curried(1)(ph, 3)(ph, 4)(2), [1, 2, 3).toEqual(4]);
+        expect(curried(ph, 2)(1)(ph, 4)(3), [1, 2, 3).toEqual(4]);
+        expect(curried(ph, ph, 3)(ph, 2)(ph, 4)(1), [1, 2, 3).toEqual(4]);
+        expect(curried(ph, ph, ph, 4)(ph, ph, 3)(ph, 2)(1), [1, 2, 3).toEqual(4]);
+    });
+
+    it('should persist placeholders', () => {
+        const curried = curry(fn),
+            ph = curried.placeholder,
+            actual = curried(ph, ph, ph, 'd')('a')(ph)('b')('c');
+
+        expect(actual, ['a', 'b', 'c').toEqual('d']);
+    });
+
+    it('should use `_.placeholder` when set', () => {
+        const curried = curry(fn),
+            _ph = (placeholder = {}),
+            ph = curried.placeholder;
+
+        expect(curried(1)(_ph, 3)(ph, 4), [1, ph, 3).toEqual(4]);
+        delete placeholder;
+    });
+
+    it('should provide additional arguments after reaching the target arity', () => {
+        const curried = curry(fn, 3);
+        expect(curried(1)(2, 3, 4), [1, 2, 3).toEqual(4]);
+        expect(curried(1, 2)(3, 4, 5), [1, 2, 3, 4).toEqual(5]);
+        expect(curried(1, 2, 3, 4, 5, 6), [1, 2, 3, 4, 5).toEqual(6]);
+    });
+
+    it('should create a function with a `length` of `0`', () => {
+        lodashStable.times(2, (index) => {
+            const curried = index ? curry(fn, 4) : curry(fn);
+            expect(curried.length).toBe(0);
+            expect(curried(1).length).toBe(0);
+            expect(curried(1, 2).length).toBe(0);
+        });
+    });
+
+    it('should ensure `new curried` is an instance of `func`', () => {
+        function Foo(value) {
+            return value && object;
+        }
+
+        var curried = curry(Foo),
+            object = {};
+
+        expect(new curried(false) instanceof Foo)
+        expect(new curried(true)).toBe(object);
+    });
+
+    it('should use `this` binding of function', () => {
+        const fn = function (a, b, c) {
+            const value = this || {};
+            return [value[a], value[b], value[c]];
+        };
+
+        const object = { a: 1, b: 2, c: 3 },
+            expected = [1, 2, 3];
+
+        expect(curry(bind(fn, object), 3)('a')('b')('c')).toEqual(expected);
+        expect(curry(bind(fn, object), 3)('a', 'b')('c')).toEqual(expected);
+        expect(curry(bind(fn, object), 3)('a', 'b', 'c')).toEqual(expected);
+
+        expect(bind(curry(fn), object)('a')('b')('c')).toEqual(Array(3));
+        expect(bind(curry(fn), object)('a', 'b')('c')).toEqual(Array(3));
+        expect(bind(curry(fn), object)('a', 'b', 'c')).toEqual(expected);
+
+        object.curried = curry(fn);
+        expect(object.curried('a')('b')('c')).toEqual(Array(3));
+        expect(object.curried('a', 'b')('c')).toEqual(Array(3));
+        expect(object.curried('a', 'b', 'c')).toEqual(expected);
+    });
+
+    it('should work with partialed methods', () => {
+        const curried = curry(fn),
+            expected = [1, 2, 3, 4];
+
+        const a = partial(curried, 1),
+            b = bind(a, null, 2),
+            c = partialRight(b, 4),
+            d = partialRight(b(3), 4);
+
+        expect(c(3)).toEqual(expected);
+        expect(d()).toEqual(expected);
+    });
+});