mathjs
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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.
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JavaScript
// test object utils
var assert = require('assert'),
approx = require('../../tools/approx'),
object = require('../../lib/util/object');
describe ('object', function () {
describe('clone', function() {
it('should clone undefined', function () {
assert.strictEqual(object.clone(undefined), undefined);
});
it('should clone null', function () {
assert.strictEqual(object.clone(null), null);
});
it('should clone booleans', function () {
assert.strictEqual(object.clone(true), true);
assert.strictEqual(object.clone(false), false);
assert.ok(object.clone(new Boolean(true)) instanceof Boolean);
assert.equal(object.clone(new Boolean(true)), true);
assert.equal(object.clone(new Boolean(false)), false);
});
it('should clone numbers', function () {
assert.strictEqual(object.clone(2.3), 2.3);
assert.ok(object.clone(new Number(2.3)) instanceof Number);
assert.equal(object.clone(new Number(2.3)), 2.3);
});
it('should clone strings', function () {
assert.strictEqual(object.clone('hello'), 'hello');
assert.ok(object.clone(new String('hello')) instanceof String);
assert.equal(object.clone(new String('hello')), 'hello');
});
it('should (deep) clone objects', function () {
var obj = {a: {b: 'c', d: new Date(2014,0,1)}};
var clone = object.clone(obj);
assert.deepEqual(obj, clone);
// check whether the clone remains unchanged when changing the original object
obj.a.b = 'cc';
assert.equal(clone.a.b, 'c');
obj.a.d.setMonth(2);
assert.equal(clone.a.d.valueOf(), new Date(2014,0,1).valueOf());
});
it('should clone dates', function () {
var d1 = new Date(2014,1,1);
var d2 = object.clone(d1);
assert.equal(d1.valueOf(), d2.valueOf());
d1.setMonth(2);
assert.notEqual(d1, d2);
});
it('should (deep) clone arrays', function () {
var d = new Date(2014,0,1);
var arr = [1, 2, d, {a: 3}]
var clone = object.clone(arr);
assert.deepEqual(arr, clone);
assert.notStrictEqual(arr, clone);
assert.notStrictEqual(arr[2], clone[2]);
assert.notStrictEqual(arr[3], clone[3]);
// check whether the clone remains unchanged when changing the original object
arr[2] = null;
arr[3].a = 1;
d.setMonth(2);
assert.equal(clone[2].valueOf(), new Date(2014,0,1).valueOf());
assert.equal(clone[3].a, 3);
});
it('should throw an error in case of an unsupported type', function () {
assert.throws(function () {object.clone(/a regexp/)}, /Cannot clone/);
});
});
describe('extend', function() {
it ('should extend an object with all properties of an other object', function () {
var e = {};
var o1 = {a: 2, b: 3};
var o2 = {a: 4, b: null, c: undefined, d: 5, e: e};
var o3 = object.extend(o1, o2);
assert.strictEqual(o1, o3);
assert.strictEqual(o1.e, o3.e);
assert.deepEqual(o3, {a: 4, b: null, c: undefined, d: 5, e: e});
assert.deepEqual(o2, {a: 4, b: null, c: undefined, d: 5, e: e}); // should be unchanged
});
it('should ignore inherited properties when extending an object', function () {
Object.prototype.foo = 'bar';
var o1 = {a: 2, b: 3};
var o2 = object.extend({}, o1);
assert.equal(o2['foo'], 'bar');
assert.equal(o2.hasOwnProperty('foo'), false);
delete Object.prototype.foo;
});
});
describe('deepExtend', function() {
it ('should deep extend an object with all properties of an other object', function () {
var e = {f: {g: 3}};
var o1 = {a: 2, b: 3};
var o2 = {a: 4, b: null, c: undefined, d: 5, e: e};
var o3 = object.deepExtend(o1, o2);
assert.strictEqual(o1, o3);
assert.notStrictEqual(o3.e, o2.e);
assert.deepEqual(o3, {a: 4, b: null, c: undefined, d: 5, e: {f: {g: 3}}});
assert.deepEqual(o2, {a: 4, b: null, c: undefined, d: 5, e: {f: {g: 3}}}); // should be unchanged
e.f.g = 4;
assert.deepEqual(o3, {a: 4, b: null, c: undefined, d: 5, e: {f: {g: 3}}}); // should be unchanged
assert.deepEqual(o2, {a: 4, b: null, c: undefined, d: 5, e: {f: {g: 4}}}); // should be changed
});
it ('should throw an error when deep extending an array (is not yet supported)', function () {
assert.throws(function () {object.deepExtend({}, [])}, /Arrays are not supported by deepExtend/);
assert.throws(function () {object.deepExtend({}, {a: []})}, /Arrays are not supported by deepExtend/);
assert.throws(function () {object.deepExtend({}, {a: {b: []}})}, /Arrays are not supported by deepExtend/);
});
it('should ignore inherited properties when deep extending an object', function () {
Object.prototype.foo = 'bar';
var o1 = {a: 2, b: 3};
var o2 = object.deepExtend({}, o1);
assert.equal(o2['foo'], 'bar');
assert.equal(o2.hasOwnProperty('foo'), false);
delete Object.prototype.foo;
});
});
describe('deepEqual', function() {
it('should deep compare two objects', function () {
assert.equal(object.deepEqual({}, {}), true);
assert.equal(object.deepEqual({a: 2, b: 3}, {a: 2, b: 3}), true);
assert.equal(object.deepEqual({a: 2, b: 3}, {a: 2, b: 4}), false);
assert.equal(object.deepEqual({a: 2, b: 3}, {a: 2}), false);
assert.equal(object.deepEqual({a: 2}, {a: 2, b: 3}), false);
assert.equal(object.deepEqual({a: 2, b: 3}, {a: 2, b: {}}), false);
assert.equal(object.deepEqual({a: 2, b: {}}, {a: 2, b: {}}), true);
assert.equal(object.deepEqual({a: 2, b: {c: 4}}, {a: 2, b: {c: 4}}), true);
assert.equal(object.deepEqual({a: 2, b: {c: 4}}, {a: 2, b: {c : 5}}), false);
assert.equal(object.deepEqual({a: 2, b: {c: 4}}, {a: 2, b: {}}), false);
assert.equal(object.deepEqual({a: 2, b: {}}, {a: 2, b: {c: 4}}), false);
});
it('should deep compare two arrays', function () {
assert.equal(object.deepEqual([], []), true);
assert.equal(object.deepEqual([1, 2], [1, 2]), true);
assert.equal(object.deepEqual([1, 2], [1, 2, 3]), false);
assert.equal(object.deepEqual([1, 0, 3], [1, 2, 3]), false);
assert.equal(object.deepEqual([1, 2, [3, 4]], [1, 2, [3, 4]]), true);
assert.equal(object.deepEqual([1, 2, [3]], [1, 2, [3, 4]]), false);
assert.equal(object.deepEqual([1, 2, [3, 4]], [1, 2, [3]]), false);
assert.equal(object.deepEqual([1, 2, null], [1, 2, [3]]), false);
assert.equal(object.deepEqual([1, 2, [3]], [1, 2, null]), false);
assert.equal(object.deepEqual([1, 2, 3], [1, 2, [3]]), false);
assert.equal(object.deepEqual([1, 2, [3]], [1, 2, 3]), false);
});
it('should deep compare mixed objects an arrays', function () {
assert.equal(object.deepEqual({}, []), false);
assert.equal(object.deepEqual({a: {}}, {a: []}), false);
assert.equal(object.deepEqual({a: [1,2,3]}, {a:[1,2,3]}), true);
assert.equal(object.deepEqual({a: [1,2,{}]}, {a:[1,2,{}]}), true);
assert.equal(object.deepEqual({a: [1,2,{b: 4}]}, {a:[1,2,{b: 4}]}), true);
assert.equal(object.deepEqual({a: [1,2,{b: 4}]}, {a:[1,2,{b: 5}]}), false);
assert.equal(object.deepEqual({a: [1,2,{b: 4}]}, {a:[1,2,{}]}), false);
assert.equal(object.deepEqual([1, 2, {}], [1, 2, {}]), true);
assert.equal(object.deepEqual([1, 2, {a: 3}], [1, 2, {a : 3}]), true);
assert.equal(object.deepEqual([1, 2, {a: 3}], [1, 2, {a : 4}]), false);
assert.equal(object.deepEqual([1, 2, {a: 3}], [1, 2, 3]), false);
assert.equal(object.deepEqual([1, 2, 3], [1, 2, {a: 3}]), false);
assert.equal(object.deepEqual([1, 2, {a: [3, 4]}], [1, 2, {a: [3, 4]}]), true);
assert.equal(object.deepEqual([1, 2, {a: [3, 4]}], [1, 2, {a: [3, 4, 5]}]), false);
});
it('should not ignore inherited properties during comparison', function () {
Object.prototype.foo = 'bar';
assert.equal(object.deepEqual({}, {}), true);
assert.equal(object.deepEqual({foo: 'bar'}, {}), true);
delete Object.prototype.foo;
});
});
describe('canDefineProperty', function() {
it('should test whether defineProperty is available', function () {
assert.equal(object.canDefineProperty(), true);
});
});
describe('lazy', function() {
it('should get a lazy property', function () {
var obj = {};
var count = 0;
object.lazy(obj, 'x', function () {
count++;
return 2;
});
var x = obj.x;
assert.equal(x, 2);
assert.equal(count, 1);
var x2 = obj.x;
assert.equal(x2, 2);
assert.equal(count, 1);
});
it('should set a lazy property', function () {
var obj = {};
object.lazy(obj, 'x', function () {
return 2;
});
obj.x = 3;
var x = obj.x;
assert.equal(x, 3);
});
});
});