xtypeof
v2.0.5
Published
Extended typeof
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Maintainers
nicolae.g.iotuReadme
xtypeof
xtypeof is extended typeof.
This simple single function module has zero dependencies, is seriously fast and lightweight and should run in all environments.
xtypeof function takes a single parameter which can be anything and returns a lowercase string representing the extended type of object passed including builtins and all other types available in the environment.
By value returns include "undefined", "null", "boolean", "number", "bigint", "string", "symbol", "function", "object", "array", "map", "set", "date", "regexp", "weakmap", "weakset", "promise", "arraybuffer", "sharedarraybuffer", "dataview", "int8array", "uint8array", "uint8clampedarray", "int16array", "uint16array", "int32array", "uint32array", "float32array", "float64array", "bigint64array", "biguint64array", "error" and all other environment specific extended lowercase types such as "htmldivelement" a.m.o.
Examples
Node.js
const xtypeof = require('xtypeof')
console.log(xtypeof([])) // 'array'
console.log(xtypeof('a')) // 'string'
console.log(xtypeof(null)) // 'null'
console.log(xtypeof(BigInt(123))) // 'bigint'
console.log(xtypeof(Buffer.alloc(5))) // 'uint8array'
console.log(xtypeof(new Error('err'))) // 'error'
console.log(xtypeof(new RangeError('oor'))) // 'error'Browser
...
<head>
...
<script src="./xtypeof.bundle.js"></script>
...
...
<script>
console.log(xtypeof([])); // 'array'
console.log(xtypeof('a')); // 'string'
console.log(xtypeof(null)); // 'null'
console.log(xtypeof(BigInt(123))); // 'bigint'
console.log(xtypeof(new Error('err'))); // 'error'
console.log(xtypeof(new RangeError('oor'))); // 'error'
...
</script>
...Others
Inspired by https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof#Examples
There is an exception with Proxy which is not a regular type and will be recognized as 'object'. This is done for efficiency.
If you feel 'module' is a bit too much of a title for xtypeof :) then just use its main function:
function xtypeof(o) {
return Object.prototype.toString.call(o).slice(8, -1).toLowerCase()
}Documentation
© Copyright 2020 Nicolae Iotu, [email protected]