var arr = [{ id: 1, name: 'JOHN' },
{ id: 2, name: 'JENNIE'},
{ id: 3, name: 'JENNAH' }];
function userExists(name) {
return arr.some(function(el) {
return el.name === name;
});
}
console.log(userExists('JOHN')); // true
console.log(userExists('JUMBO')); // falsevar arr = [{ id: 1, username: 'fred' },
{ id: 2, username: 'bill'},
{ id: 3, username: 'ted' }];
function userExists(username) {
return arr.some(function(el) {
return el.username === username;
});
}
console.log(userExists('fred')); // true
console.log(userExists('bred')); // false
var obj = {a: 5};
var array = [obj, "string", 5]; // Must be same object
array.indexOf(obj) !== -1 // True addPerson = (person) => {
let filteredPerson = this.state.likes.filter(like => like.name !== person.name);
this.setState({
likes: [...filteredPerson, person]
})
}