Is there a way to check if my object contain array? for example:
let object1 = {
name:'abc',
items:[
{item_name:'123'},
{item_name:'456'}
]
}
Imagine object1 is coming from server and I am not sure that it will or will not (or even have more) array in it. Is there a proper way to do this?
You can use Array.prototype.some and Object.values() to iterate and determine if any value is an array.
let object1 = {
name:'abc',
items:[{item_name:'123'},{item_name:'456'}]
}
let res = Object.values(object1).some((val) => Array.isArray(val));
console.log(res);You can use Object.keys()
The
Object.keys()method returns an array of a given object's own property names, in the same order as we get with a normal loop.
The
some()method tests whether at least one element in the array passes the test implemented by the provided function.
with Array.isArray()
The
Array.isArray()method determines whether the passed value is an Array.
let object1 = {
name:'abc',
items:[
{item_name:'123'},
{item_name:'456'}
]
}
var r = Object.keys(object1).some(i => Array.isArray(object1[i]));
console.log(r);You can use Some and Array.isArray
let object1 = {name:'abc',items:[{item_name:'123'},{item_name:'456'}]}
let op = Object.values(object1).some(e=>Array.isArray(e))
console.log(op)
Object.keys, it was different to the other answers
Use isArray(). It tells if an object is an array or not. Refer
let object1 = {
name:'abc',
items:[
{item_name:'123'},
{item_name:'456'}
]
}
Object.values(object1).forEach((e)=>{
if(Array.isArray(e))
{
console.log('true')
}})
forEach callback does nothing. This will once again perform unnecessary comparisons after finding the first arrayUse find and isArray on Object.values, then convert length to Boolean:
let object1 = {
name:'abc',
items:[
{item_name:'123'},
{item_name:'456'}
]
}
console.log(Boolean(Object.values(object1).find(e => Array.isArray(e)).length));
itemsarray in it? Or just any array?{ foo: { bar: [1,2,3] } }?