check-more-types

> Large collection of predicates, inspired by check-types.js

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!issue

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[semantic-url]: https://github.com/semantic-release/semantic-release

See Readable conditions
for advice and examples.

Install

node: npm install check-more-types --save

var check = require('check-more-types');
console.assert(check.bit(1), 'check.bit works');

browser bower install check-more-types --save

* API
* check.email
* check.extension (alias check.ext)
* check.odd and check.even
* check.port
* check.systemPort
* check.userPort
* check.error
* check.https (alias secure)
* check.http
* check.webUrl (alias url)
* check.contains
* check.defined
* check.semver
* check.positiveNumber (alias check.positive)
* check.negativeNumber (alias check.negative)
* check.type
* check.bit
* check.primitive
* check.zero
* check.git
* check.commitId
* check.shortCommitId
* check.index
* check.oneOf
* check.same
* check.length
* check.sameLength
* check.allSame
* check.unit
* check.hexRgb
* check.bool
* check.emptyString
* check.empty
* check.unempty
* check.unemptyArray
* check.arrayOfStrings (alias strings)
* check.numbers
* check.arrayOf
* check.badItems
* check.arrayOfArraysOfStrings
* check.lowerCase
* check.has(obj, property)
* check.all
* check.schema
* check.schema bind
* schema composition
* check.raises(fn, validator)
* Modifiers
* check.maybe
* check.not
* check.verify
* Adding your own predicates
* check.mixin(predicate, name)
* check.mixin does not override
* Defending a function
* check.defend(fn, predicates)
* protects optional arguments
* check.defend with messages
* check.defend in module pattern
* Safe callback execution
* check.then
* check.found
* check.regexp
* check.promise
* check.validDate
* check.equal
* check.or
* check.and

#### check.number

check.number is part of the check-types library, but as a note, it does not pass
null, undefined or NaN values

``js
check.number(null); // false
check.not.number(undefined); // true
check.number(NaN); // false
`

#### check.email

Really simple regex email check. Should not be relied to be robust.

`js
check.email('me@foo.bar') // true
check.email('me.foo.bar') // false
`

#### check.extension (alias check.ext)

Confirms that given file name has expected extension

`js
check.extension('txt', 'foo/bar.txt') // true
`

It is curried, so you can create convenient methods

`js
const isJs = check.extension('js')
isJs('script.js') // true
`

There are a couple of convenient shortcuts, like check.isJs, check.isJson, check.isJpg

#### check.odd and check.even

Check if a number odd or even

`js
check.odd(2) // false
check.odd(3) // true
check.even(2) // true
`

#### check.port

Returns true if passed argument is positive number less or equal to largest
allowed port number 65535

#### check.systemPort

Returns true if passed argument is number between 0 and 1024

#### check.userPort

Returns true if passed argument is a port number and larger than 1024

#### check.error

Returns true if given argument is an instance of type Error

#### check.https (alias secure)

Returns true if the provided url starts with https://. Alias secure.

#### check.http

Returns true if the provided url starts with http://

#### check.webUrl (alias url)

Returns true if the given string is http or https url.

#### check.contains

Returns true if given array contains an item, or given string contains substring.

`js
check.contains(['foo', 42], 'foo'); // true
check.contains('apple', 'pp'); // true
`

#### check.defined

check.defined(0); // true
check.defined(1); // true
check.defined(true); // true
check.defined(false); // true
check.defined(null); // true
check.defined(''); // true
check.defined(); // false
check.defined(root.doesNotExist); // false
check.defined({}.doesNotExist); // false

---

#### check.semver

check.semver('1.0.2'); // true
check.semver('1.0.2-alpha'); // false

---

#### check.positiveNumber (alias check.positive)

`js
check.positive(100); // true
check.not.positive(-1); // true
`

---

#### check.negativeNumber (alias check.negative)

`js
check.negative(-10); // true
check.not.negativeNumber(1); // true
`

---

#### check.type

check.type('string', 'foo'); // true
check.type('number', 42); // true

check.type is curried.

---

#### check.bit

check.bit(0); // true
check.bit(1); // true
check.bit('1'); // false
check.bit(2); // false
check.bit(true); // false

---

#### check.primitive

Returns true for primitive JavaScript types

check.primitive(42); // true
check.primitive(true); // true
check.primitive('foo'); // true
check.primitive([]); // false

Also returns true for Symbol ES6 syntax.

---

#### check.zero

check.zero(0); // true
check.zero(); // false
check.zero(null); // false

---

#### check.git

check.git('url string');

---

#### check.commitId

---

#### check.shortCommitId

---

#### check.index

---

#### check.oneOf

var colors = ['red', 'green', 'blue'];
var color = 'green';
check.oneOf(colors, color); // true
check.oneOf(colors, 'brown'); // false

Function is curried

---

#### check.same

var foo = {}
var bar = {}
check.same(foo, foo); // true
check.same(foo, bar); // false
// primitives are compared by value
check.same(0, 0); // true
check.same('foo', 'foo'); // true

check.same should produce same result as ===.

---

#### check.length

Confirms length of a string or an Array. The function is curried and
can guess the argument order

`js
check.length([1, 2], 2); // true
check.length('foo', 3); // true
// argument order
check.length(3, 'foo'); // true
// curried call
check.length('foo')(3); // true
check.length(3)('foo'); // true
`

---

#### check.sameLength

check.sameLength([1, 2], ['a', 'b']); // true
check.sameLength('ab', 'cd'); // true
// different types
check.sameLength([1, 2], 'ab'); // false

---

#### check.allSame

var foo = {}
var bar = {}
check.allSame([foo, foo, foo]); // true
check.allSame([foo, foo, bar]); // false
// primitives are compared by value
check.allSame([0, 0]); // true
check.allSame(['foo', 'foo', 'foo']); // true
check.allSame([false, 0]); // false

---

#### check.unit

check.unit(0); // true
check.unit(1); // true
check.unit(0.1); // true
check.unit(1.2); // false
check.unit(-0.1); // false

---

#### check.hexRgb

check.hexRgb('#FF00FF'); // true
check.hexRgb('#000'); // true
check.hexRgb('#aaffed'); // true
check.hexRgb('#00aaffed'); // false
check.hexRgb('aaffed'); // false

---

#### check.bool

check.bool(true); // true
check.bool(false); // true
check.bool(0); // false
check.bool(1); // false
check.bool('1'); // false
check.bool(2); // false

---

#### check.emptyString

check.emptyString(''); // true
check.emptyString(' '); // false
check.emptyString(0); // false
check.emptyString([]); // false

---

#### check.empty

check.empty([]); // true
check.empty(''); // true
check.empty({}); // true
check.empty(0); // false
check.empty(['foo']); // false

---

#### check.unempty

check.unempty([]); // false
check.unempty(''); // false
check.unempty({}); // false
check.unempty(0); // true
check.unempty(['foo']); // true
check.unempty('foo'); // true

---

#### check.unemptyArray

check.unemptyArray(null); // false
check.unemptyArray(1); // false
check.unemptyArray({}); // false
check.unemptyArray([]); // false
check.unemptyArray(root.doesNotExist); // false
check.unemptyArray([1]); // true
check.unemptyArray(['foo', 'bar']); // true

---

#### check.arrayOfStrings (alias strings)

// second argument is checkLowerCase
check.arrayOfStrings(['foo', 'Foo']); // true
check.arrayOfStrings(['foo', 'Foo'], true); // false
check.arrayOfStrings(['foo', 'bar'], true); // true
check.arrayOfStrings(['FOO', 'BAR'], true); // false

---

#### check.numbers

Returns true if all items in an array are numbers

#### check.arrayOf

`js
check.arrayOf(check.unemptyString, ['foo', '']); // false
check.arrayOf(check.unemptyString, ['foo', 'bar']); // true
// can be partially applied and combined with check.schema
var person = {
first: check.unemptyString,
last: check.unemptyString
};
var isPerson = check.schema.bind(null, person);
var arePeople = check.arrayOf.bind(null, isPerson);
var people = [{
first: 'foo',
last: 'bar'
}];
arePeople(people); // true
`
---

Why would you need check.arrayOf(predicate, x) and not simply use x.every(predicate)?
Because x might not be an Array.

#### check.badItems

Finds items that do not pass predicate

`js
check.badItems(check.unemptyString, ['foo', '', 'bar']); // ['']
`

#### check.arrayOfArraysOfStrings

// second argument is checkLowerCase
check.arrayOfArraysOfStrings([['foo'], ['bar'}}); // true
check.arrayOfArraysOfStrings([['foo'], ['bar'}}, true); // true
check.arrayOfArraysOfStrings([['foo'], ['BAR'}}, true); // false

---

#### check.lowerCase

check.lowerCase('foo bar'); // true
check.lowerCase('*foo ^bar'); // true
check.lowerCase('fooBar'); // false
// non-strings return false
check.lowerCase(10); // false

---

#### check.has(obj, property)

var obj = {
foo: 'foo',
bar: 0
}
check.has(obj, 'foo'); // true
check.has(obj, 'bar'); // true
check.has(obj, 'baz'); // false
// non-object returns false
check.has(5, 'foo'); // false
check.has('foo', 'length'); // true

---

#### check.all

var obj = {
foo: 'foo',
bar: 'bar',
baz: 'baz'
}
var predicates = {
foo: check.unemptyString,
bar: function(value) {
return value === 'bar'
}
}
check.all(obj, predicates); // true

---

#### check.schema

var obj = {
foo: 'foo',
bar: 'bar',
baz: 'baz'
}
var schema = {
foo: check.unemptyString,
bar: function(value) {
return value === 'bar'
}
}
check.schema(schema, obj); // true
check.schema(schema, {}); // false

check.spec is equivalent to check.all but with arguments reversed.
This makes it very convenient to create new validator functions using partial
argument application

The method is curried, thus you can easily create predicate function

`js
var hasName = check.schema({ name: check.unemptyString });
hasName({ name: 'joe' }); // true
`

#### check.schema bind

var personSchema = {
name: check.unemptyString,
age: check.positiveNumber
}
var isValidPerson = check.schema.bind(null, personSchema)
var h1 = {
name: 'joe',
age: 10
}
var h2 = {
name: 'ann'
// missing age property
}
isValidPerson(h1); // true
isValidPerson(h2); // false

If you want you can manually bind check.schema to first argument

var personSchema = {
name: check.unemptyString,
age: check.positiveNumber
};
var isValidPerson = check.schema.bind(null, personSchema);
var h1 = {
name: 'joe',
age: 10
};
var h2 = {
name: 'ann'
// missing age property
};
isValidPerson(h1); // true
isValidPerson(h2); // false

You can use Function.prototype.bind or any partial application method, for example
_.partial(check.schema, personSchema);.
Because bound schema parameter generates a valid function, you can nest checks using
schema composition. For example let us combine the reuse isValidPerson as part of
another check

#### schema composition

var teamSchema = {
manager: isValidPerson,
members: check.unemptyArray
}
var team = {
manager: {
name: 'jim',
age: 20
},
members: ['joe', 'ann']
}
check.schema(teamSchema, team); // true

---

#### check.raises(fn, validator)

function foo() {
throw new Error('foo')
}

function bar() {}

function isValidError(err) {
return err.message === 'foo'
}

function isInvalid(err) {
check.instance(err, Error); // true
return false
}
check.raises(foo); // true
check.raises(bar); // false
check.raises(foo, isValidError); // true
check.raises(foo, isInvalid); // false

$3

Every predicate function is also added to check.maybe object.
The maybe predicate passes if the argument is null or undefined,
or the predicate returns true.

#### check.maybe

check.maybe.bool(); // true
check.maybe.bool('true'); // false
var empty
check.maybe.lowerCase(empty); // true
check.maybe.unemptyArray(); // true
check.maybe.unemptyArray([]); // false
check.maybe.unemptyArray(['foo', 'bar']); // true

Every function has a negated predicate in check.not object

#### check.not

check.not.bool(4); // true
check.not.bool('true'); // true
check.not.bool(true); // false

Every predicate can also throw an exception if it fails

#### check.verify

check.verify.arrayOfStrings(['foo', 'bar'])
check.verify.bit(1)

function nonStrings() {
check.verify.arrayOfStrings(['Foo', 1])
}
check.raises(nonStrings); // true
function nonLowerCase() {
check.verify.lowerCase('Foo')
}
check.raises(nonLowerCase); // true

---

$3

You can add new predicates to check, check.maybe, etc. by using check.mixin(predicate)
method. If you do not pass a name, it will try using function's name.

#### check.mixin(predicate, name)

function isBar(a) {
return a === 'bar'
}
check.mixin(isBar, 'bar')
check.bar('bar'); // true
check.bar('anything else'); // false
// supports modifiers
check.maybe.bar(); // true
check.maybe.bar('bar'); // true
check.not.bar('foo'); // true
check.not.bar('bar'); // false

Mixin will not override existing functions

#### check.mixin does not override

function isFoo(a) {
return a === 'foo'
}

function isBar(a) {
return a === 'bar'
}
check.mixin(isFoo, 'isFoo')
check.isFoo; // isFoo
check.mixin(isBar, 'isFoo')
check.isFoo; // isFoo

$3

Using check-more-types you can separate the inner function logic from checking input
arguments. Instead of this

`js
function add(a, b) {
la(check.number(a), 'first argument should be a number', a);
la(check.number(a), 'second argument should be a number', b);
return a + b;
}
`

you can use check.defend function

#### check.defend(fn, predicates)

function add(a, b) {
return a + b
}
var safeAdd = check.defend(add, check.number, check.number)
add('foo', 2); // 'foo2'
// calling safeAdd('foo', 2) raises an exception
check.raises(safeAdd.bind(null, 'foo', 2)); // true

---

#### protects optional arguments

function add(a, b) {
if (typeof b === 'undefined') {
return 'foo'
}
return a + b
}
add(2); // 'foo'
var safeAdd = check.defend(add, check.number, check.maybe.number)
safeAdd(2, 3); // 5
safeAdd(2); // 'foo'

---

You can add extra message after a predicate

#### check.defend with messages

function add(a, b) {
return a + b
}
var safeAdd = check.defend(add, check.number, 'a should be a number', check.string, 'b should be a string')
safeAdd(2, 'foo'); // '2foo'
function addNumbers() {
return safeAdd(2, 3)
}

function checkException(err) {
err.message; // 'Argument 2: 3 does not pass predicate: b should be a string'
return true
}
check.raises(addNumbers, checkException); // true

---

This works great when combined with JavaScript module pattern as in this example

#### check.defend in module pattern

var add = (function() {
// inner private function without any argument checks
function add(a, b) {
return a + b
}
// return defended function
return check.defend(add, check.number, check.number)
}())
add(2, 3); // 5
// trying to call with non-numbers raises an exception
function callAddWithNonNumbers() {
return add('foo', 'bar')
}
check.raises(callAddWithNonNumbers); // true

---

$3

Sometimes we want to execute a function depending on the condition, but without throwing an
exception. For these cases, there is check.then

#### check.then

function isSum10(a, b) {
return a + b === 10
}

function sum(a, b) {
return a + b
}
var onlyAddTo10 = check.then(isSum10, sum)
// isSum10 returns true for these arguments
// then sum is executed
onlyAddTo10(3, 7); // 10
onlyAddTo10(1, 2); // undefined
// sum is never called because isSum10 condition is false

----

#### check.found

Great for quickly checking string or array search results

`js
check.found('foo'.indexOf('f')); // true
check.found('foo bar'.indexOf('bar')); // true
`

#### check.regexp

Returns true if the passed value is a regular expression.

#### check.promise

Returns true if given object has promise methods (.then, etc)

#### check.validDate

Returns true if the given instance is a Date and is valid.

#### check.equal

Curried shallow strict comparison

`js
var foo = 'foo';
check.equal(foo, 'foo'); // true
var isFoo = check.equal('foo');
isFoo('foo'); // true
isFoo('bar'); // false
`

#### check.or

Combines multiple predicates into single one using OR logic

`js
var predicate = check.or(check.bool, check.unemptyString);
predicate(true); // true
predicate('foo'); // true
predicate(42); // false
`

It treats non-functions as boolean values

`js
var predicate = check.or(check.unemptyString, 42);
// will always return true
predicate('foo'); // true, because it is unempty string
predicate(false); // true, because 42 is truthy
`

Note: if there are any exceptions inside the individual predicate functions, they are
treated as false values.

#### check.and

Combines multiple predicates using AND. If the predicate is not a function,
evaluates it as a boolean value.

`js
function isFoo(x) { return x === 'foo'; }
check.and(check.unemptyString, isFoo); // only true for "foo"
`

Both check.or and check.and are very useful inside check.schema to create
more powerful predicates on the fly.

`js
var isFirstLastNames = check.schema.bind(null, {
first: check.unemptyString,
last: check.unemptyString
});
var isValidPerson = check.schema.bind(null, {
name: check.or(check.unemptyString, isFirstLastNames)
});
isValidPerson({ name: 'foo' }); // true
isValidPerson({ name: {
first: 'foo',
last: 'bar'
}}); // true
``

$3

Author: Kensho © 2014

* @kensho
* kensho.com

Support: if you find any problems with this library,
open issue on Github

This documentation was generated using grunt-xplain
and grunt-readme.

MIT License

The MIT License (MIT)

Copyright (c) 2014 Kensho

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.