Node-is NPM | npm.io

is.js v0.5.2

simplified descriptive type testing library

Supporting Node, AMDs and the browsers ( IE 6+, Chrome 1+, Firefox 3.6+, Opera 12.1+, Safari 5.1+ )

Usage

node.js

Install node-is as dependency using npm in the command line

> npm install node-js --save

Include the module in your projects javascript file

var is = require("node-is");

Browser

Download the code from Github: is.min.js

Include it in your project

<script src="path/to/is.min.js" type="text/Javascript"></script>

Test functions, returning true, when type is matching

is.Number(1) test for numbers
is.Integer(1) test for integers
is.Float(.001) test for floating point numbers
is.Negative(-1.5) test for negative values
is.Positive(1.5) test for positive values
is.NaN(NaN) test for NaN (isNaN link)
is.Finite(1) test for finite values (isFinite link)
is.Infinity(Infinity) test for Infinity and -Infinity
is.Boolean(false) test for boolans
is.True(true) test for true booleans
is.False(false) test for false booleans
is.String("is") test for strings
is.EmptyString("") test for empty strings
is.Undefined(undefined) test for undefined
is.Defined({}) (!is.Undefined)
is.Null(null) test for null
is.Function(function() {}) test for functions
is.Array([]) test for arrays
is.EmptyArray([]) test for empty arrays
is.RegExp(/^/g) test for regular expressions
is.Object({}) test for objects
is.RealObject({}) tests for real objects, null, arrays, regular expressions and errors will return false
is.Error(new Error()) test for errors
is.ReferenceError(new ReferenceError()) test for reference errors
is.TypeError(new TypeError()) test for type errors
is.SyntaxError(new SyntaxError()) test for syntax errors
is.URIError(new URIError()) test for uri errors
is.EvalError(new EvalError()) test for eval errors
is.RangeError(new RangeError()) test for range errors
is.RealError(new Error()) test for real Error-objects only, will not match RangeError, EvalError, URIError, SyntaxError, TypeError, ReferenceError

Multitest function `is.type.of(obj1[, obj2[, obj3[, ...]]])`

returns two testing functions:

equal() which can be used to test for various types that have to match all, e.g.: is.type.of(1,0).equal("Number","Integer","!Negative"); // returns true
either() to test for various types, where at least one has to match, e.g.: is.type.of(1,0,2).either("Float","Integer"); //returns true

equal() and either() can be used to test with custom functions too: is.type.of("hello", "world").equal("String", "!EmptyString", function(elm) { return elm[3]==="l"; }); //returns true

Use with mocha `is.expect`

You can now check types for your tests with mocha. Example:

var expect = require("node-is").expect;

describe("moche with node-is example", function() {
    it("is easy and awesome", function() {
            expect.type.of(1).to.be.equal("Integer", "Positive");
            expect.type.of(-1).to.be.either("Positive", "Negative");
    });
});

Extend is.js using custom test functions `is.extend(name, fn)`

Parameters:

name {String} test name, the function will be registered to is.<name>
fn {Function} test function, should accept one argument and return a Boolean

Example:

// register
is.extend("HelloWorld", function(value) {
    return is.String(value) && value === "Hello, World!";
});

// use
is.HelloWorld("Hello, World!"); // returns true
is.HelloWorld("Hello, Earth!"); // returns false

Changelog:

0.5.2 Bower release
0.5.1 Bug fix on global object (browser), added is.EmptyArray, some small improvements
0.5.0 Added is.extend
0.4.1 Bug fix on error type testing, and some small fixes
0.4.0 Rewrote library in ES6, compiled using grunt-traceur
0.3.2 Performance optimization, added usage section to README, added detailed support information
0.3.1 bug fix #1
0.3.0 Added mocha support is.expect
0.2.0 is.type.of can now test an unlimited amount of arguments is.type.of(..).equal() and is.type.of(..).either() can now test custom functions too
0.1.1 Added travis test
0.1.0 initial version