How to tell if an attribute exists on an object
const user = {
name: "Sicrano",
age: 14
}
user.hasOwnProperty('name'); // Retorna true
user.hasOwnProperty('age'); // Retorna true
user.hasOwnProperty('gender'); // Retorna false
user.hasOwnProperty('address'); // Retorna falsejs check if object has property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: truejavascript check if is object
obj = {
"data": 123
}
arr = [
"data",
123
]
function obj_or_arr(val) {
if (typeof val === "object") { // return if is not array or object
try {
for(x of val) // is no errors happens here is an array
break;
return "array";
} catch {
return "object"; // if there was an error is an object
}
} else return false;
}
console.log(obj_or_arr(obj)) // object
console.log(obj_or_arr(arr)) // array
console.log(obj_or_arr(123)) // false
console.log(obj_or_arr("hello world")) // false
console.log(obj_or_arr(true)) // false
console.log(obj_or_arr(false)) // falsejavascript check if object
typeof yourVariable === 'object' // true if it's an object or if it's NULL.
// if you want to exclude NULL
typeof yourVariable === 'object' && yourVariable !== nullCopyright © 2021 Codeinu
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