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getType
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function getType (value) { | |
let type = typeof value; | |
if (type === 'object') { | |
return value ? Object.prototype.toString.call(value).slice(8, -1) : 'null'; | |
} | |
return type; | |
} | |
[NaN, 0, 1, Infinity, // numbers | |
null, undefined, false, 'str', // other primitives | |
new String('a'), new Boolean(true), // wrapped primitives | |
{}, [], new Map, new WeakSet(), // containers | |
/regex/, new Date(), // other custom objects | |
window, navigator, // native objects | |
function () {}, (() => {}), atob,// functions | |
Symbol(), // symbol | |
{[Symbol.toStringTag]: 'Custom'} // @@ToStringTag | |
].map(getType); | |
// and the result is | |
[ | |
"number", "number", "number", "number", // numbers | |
"null", "undefined", "boolean", "string",// other primitives | |
"String", "Boolean", // wrapped primitives - notice the uppercase | |
"Object", "Array", "Map", "WeakSet", // containers | |
"RegExp", "Date", // other custom objects | |
"Window", "Navigator", // native objects | |
"function", "function", "function", // functions | |
"symbol", // symbol | |
"Custom", // @@ToStringTag | |
]; |
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