JAVASCRIPT

if object is array javascript

Array.isArray(object);

array contains object in javascript

array.findIndex((obj) => obj.id === obj.id) !== -1

javascript object array contains

if (vendors.findIndex(item => item.Name == "Magenic") == -1) {
  //not found item
} else {
  //found item 
}

check object in array javascript

var obj = {a: 5};
var array = [obj, "string", 5]; // Must be same object
array.indexOf(obj) !== -1 // True

Check if an array contains a object in javascript

const john = {
    'name': 'John Doe',
    'email': 'john.doe@example.com'
};
const jane = {
    'name': 'Jane Doe',
    'email': 'jane.doe@example.com'
};

const list = [john, jane];
let result = list.includes(john);

console.log(result); // true

How can I check if an object is an array

In modern browsers you can do:

Array.isArray(obj)

Check if an array contains a object in javascript

const list = [{
    'name': 'John Doe',
    'email': 'john.doe@example.com'
}, {
    'name': 'Jane Doe',
    'email': 'jane.doe@example.com'
}];

const isEqual = (first, second) => {
    return JSON.stringify(first) === JSON.stringify(second);
}

const result = list.some(e => isEqual(e, {
    'name': 'John Doe',
    'email': 'john.doe@example.com'
}));

console.log(result); // true