A simple, basic, and robust set of utilities for javascript - inspired by, but not copied from, lodash.

1. Installation
2. Examples
3. Usage
4. Roadmap

$ npm i -S isdo

const { is } = require('isdo');

let foo;
is.defined(foo); // => false
is.missing(foo); // => true

foo = null;
is.defined(foo) // => true
is.missing(foo) // => true

const arry = [];
is.array(arry); // => true
is.empty(arry); // => true

arry.push(1);
is.empty(arry); // => false

You can add your own useful comparisons and checks by using is.extend.

type comparisons

• .array
• .boolean
• .float
• .function
• .integer
• .iterable
• .map
• .null
• .number
• .object
• .set
• .string
• .undefined

presence checks

• .defined
• .missing
• .notNull
• .present
• .undefined

quality checks

• .blank
• .empty

truthy/falsey checks

• .true
• .false

extending with custom methods

• .extend

presence checks

• .defined
• .missing
• .present
• .undefined

truthy/falsey checks

• .true
• .false

presence checks

• .defined
• .missing
• .present
• .undefined

truthy/falsey checks

• .true
• .false

Returns

true if target is an array, otherwise false.

Returns

true if target is a boolean, otherwise false.

Returns

true if target is a float, otherwise false.

Returns

true if target is a function, otherwise false.

Returns

true if target is an integer, otherwise false.

Returns

true if target conforms to the iterable protocol, otherwise false.

Returns

true if target is a map, otherwise false.

Returns

true if target is a number (integer or float), otherwise false.

Returns

true if target is a plain object, otherwise false.

Returns

true if target is a set, otherwise false.

Returns

true if target is a string, otherwise false.

Returns

true if target is NOT undefined, otherwise false.

Returns

true if target is either undefined or null, otherwise false.

Returns

true if target is anything other than null, even undefined, otherwise false.

Returns

true if target is both defined and not null, otherwise false.

Returns

true if target string is missing or has length < 1, otherwise false.

Returns

true if target's length < 1, otherwise false.

If target is an array or string, length = target.length, if target is a map or set, length = target.size, if target is an object, length = number of keys in target, otherwise length = 0.

Returns

true if target is a string and is one of ["t", "true", "1"], or if target is a number and is > 0, or if target is a boolean and is true, otherwise returns false.

Ignores capitalization.

Returns

true if target is a string and is one of ["f", "false", "0"], or if target is a number and is <= 0, or if target is a boolean and is false, otherwise returns false.

Ignores capitalization.

Transfers functions and nested functions from source to is.

Example

const moment = require('moment');
const isdo = require('is');

const is = isdo.is.extend({
  date: obj => moment.isDate(obj),
});

is.date('foo'); // => false
is.date(new Date()); // => true

Returns

true if all targets are defined, otherwise false.

Returns

true if all targets are undefined, otherwise false.

Returns

true if all targets are neither null nor undefined, otherwise false.

Returns

true if all targets are null or undefined, otherwise false.

Returns

true if all targets are truthy, otherwise false.

Returns

true if all targets are falsey, otherwise false.

Returns

true if at least one of targets are defined, otherwise false.

Returns

true if at least one of targets are undefined, otherwise false.

Returns

true if at least one of targets are neither null nor undefined, otherwise false.

Returns

true if at least one of targets are null or undefined, otherwise false.

Returns

true if at least one of targets are truthy, otherwise false.

Returns

true if at least one of targets are falsey, otherwise false.

• is module for common comparisons and checks i/e undefined, null, object, etc
• do module for common functions i/e merge, get, etc
• Get feedback and iterate