Package Exports
- what-is
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (what-is) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
why?
The library was written as a simple coding exercise, but then appeared useful to share 😉
how?
npm install --save what-iswhat?
whatis() function returns reasonable type names for tested values:
| description | input | result |
|---|---|---|
| null | null |
'null' |
| undefined | undefined |
'undefined' |
| strings | 'foo' |
'string' |
'' |
'string' |
|
['Hello', 'world!'].join(' ') |
'string' |
|
new String() |
'string' |
|
| numbers | 5 |
'number' |
parseInt(42) |
'number' |
|
new Number('3') |
'number' |
|
NaN |
'NaN' |
|
Infinity |
'Infinity' |
|
1 / -0 |
'Infinity' |
|
| boolean values | false |
'boolean' |
!!nonEmptyVariable |
'boolean' |
|
new Boolean('1') |
'boolean' |
|
| regular expressions | /^not$/g |
'regexp' |
new RegExp('needle', 'i') |
'regexp' |
|
| arrays | ['foo', 'bar', 'baz'] |
'array' |
new Array(10) |
'array' |
|
| objects | { foo: 'bar'} |
'object' |
{} |
'object' |
|
new Object() |
'object' |
|
Object.create(null) |
throws error to be fixed | |
| functions | function () {} |
'function' |
new Function('x', 'y', 'return x + y') |
'function' |
|
| Date objects | new Date() |
'date' |
| errors | new Error('error!') |
'error' |
new TypeError('type error!') |
'error' |
|
| arguments objects | (function(){ return arguments; })(this) |
'arguments' |
| class constructors | new MyClass() |
'myclass' |
| promises | new Promise(function() {}) |
'promise' |
Promise.resolve('data') |
'promise' |
|
Promise.reject(new Error('ERROR!')) |
'promise' |