Type
Tiny library for determining the type.
Correctly handles arrays and null and can detection different objects for the name of the constructor.
Everything works out of the box.
Size: 133 B.
Install
npm i ariarzer/typeUsage
const type = require('type');
type([]); //=> 'array'
type(new Date()); //=> 'object'Also you can use the second argument true to detection objects.
In this case the constructor name is returned in lowercase.
type(new Date(), true); //=> 'date'
type(new myObject(), true); //=> 'myobject'Configuration
Modes:
-
Normal: works like almost
typeof, but it is correct to handlenulland arrays. -
All: distinguishes types of objects, returns the name of the object constructor in lowercase.
Examples:
| normal | all | |
|---|---|---|
undefined |
'undefined' |
'undefined' |
null |
'null' |
'null' |
[] |
'array' |
'array' |
Symbol() |
'symbol' |
'symbol' |
new WeakSet() |
'object' |
'weakset' |
new Date() |
'object' |
'date' |
new MyObject() |
'object' |
'myobject' |
document.createElement('div') |
'object' |
'htmldivelement' |
const config = {
mode: 'all', // string: 'all' || 'normal' (default: 'normal')
}Example of using modes:
const type = require('type');
const myType = type.create({mode: 'all'});
myType(new myObject()); //=> 'myobject'
// But, you can run that...
type(new myObject(), true); //=> 'myobject';
// ...and get a similar result. Custom types:
If you want to detect s custom type, for example, the days of the week, you can do this with use a config.
// write a config..
const week = ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'];
const customTypes = week.map((item, index) => {
return {
name: item,
is: function (arg) {
return type(arg, true) === 'date' && arg.getDay() === index;
},
};
});
// ...create a custom function...
const daysDetector = type.create(customTypes);
// ..and use it
daysDetector(new Date(2019, 4, 25)) //=> 'saturday' (May 25 2019)
daysDetector(new Date(2019, 4, 26)) //=> 'sunday' (May 26 2019)
daysDetector(new myObject()) //=> 'object'You can use modes and custom types together.
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