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Viewing file:     index.js (3.28 KB)      -rw-r--r--

'use strict';

var callBind = require('../');
var bind = require('function-bind');

var test = require('tape');

/*
 * older engines have length nonconfigurable
 * in io.js v3, it is configurable except on bound functions, hence the .bind()
 */
var functionsHaveConfigurableLengths = !!(
	Object.getOwnPropertyDescriptor
	&& Object.getOwnPropertyDescriptor(bind.call(function () {}), 'length').configurable
);

test('callBind', function (t) {
	var sentinel = { sentinel: true };
	var func = function (a, b) {
		// eslint-disable-next-line no-invalid-this
		return [this, a, b];
	};
	t.equal(func.length, 2, 'original function length is 2');
	t.deepEqual(func(), [undefined, undefined, undefined], 'unbound func with too few args');
	t.deepEqual(func(1, 2), [undefined, 1, 2], 'unbound func with right args');
	t.deepEqual(func(1, 2, 3), [undefined, 1, 2], 'unbound func with too many args');

	var bound = callBind(func);
	t.equal(bound.length, func.length + 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(bound(), [undefined, undefined, undefined], 'bound func with too few args');
	t.deepEqual(bound(1, 2), [1, 2, undefined], 'bound func with right args');
	t.deepEqual(bound(1, 2, 3), [1, 2, 3], 'bound func with too many args');

	var boundR = callBind(func, sentinel);
	t.equal(boundR.length, func.length, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(boundR(), [sentinel, undefined, undefined], 'bound func with receiver, with too few args');
	t.deepEqual(boundR(1, 2), [sentinel, 1, 2], 'bound func with receiver, with right args');
	t.deepEqual(boundR(1, 2, 3), [sentinel, 1, 2], 'bound func with receiver, with too many args');

	var boundArg = callBind(func, sentinel, 1);
	t.equal(boundArg.length, func.length - 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
	t.deepEqual(boundArg(), [sentinel, 1, undefined], 'bound func with receiver and arg, with too few args');
	t.deepEqual(boundArg(2), [sentinel, 1, 2], 'bound func with receiver and arg, with right arg');
	t.deepEqual(boundArg(2, 3), [sentinel, 1, 2], 'bound func with receiver and arg, with too many args');

	t.test('callBind.apply', function (st) {
		var aBound = callBind.apply(func);
		st.deepEqual(aBound(sentinel), [sentinel, undefined, undefined], 'apply-bound func with no args');
		st.deepEqual(aBound(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
		st.deepEqual(aBound(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');

		var aBoundArg = callBind.apply(func);
		st.deepEqual(aBoundArg(sentinel, [1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with too many args');
		st.deepEqual(aBoundArg(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
		st.deepEqual(aBoundArg(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');

		var aBoundR = callBind.apply(func, sentinel);
		st.deepEqual(aBoundR([1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with receiver and too many args');
		st.deepEqual(aBoundR([1, 2], 4), [sentinel, 1, 2], 'apply-bound func with receiver and right args');
		st.deepEqual(aBoundR([1], 4), [sentinel, 1, undefined], 'apply-bound func with receiver and too few args');

		st.end();
	});

	t.end();
});