หาธาตุจากอาเรย์จาวาสคริปต์
รหัสตัวอย่าง
N
const inventory = [
{name: 'apples', quantity: 2},
{name: 'cherries', quantity: 8}
{name: 'bananas', quantity: 0},
{name: 'cherries', quantity: 5}
{name: 'cherries', quantity: 15}
];
const result = inventory.find( ({ name }) => name === 'cherries' );
console.log(result) // { name: 'cherries', quantity: 5 }N
const simpleArray = [3, 5, 7, 15];
const objectArray = [{ name: 'John' }, { name: 'Emma' }]
console.log( simpleArray.find(e => e === 7) )
// expected output 7
console.log( simpleArray.find(e => e === 10) )
// expected output undefined
console.log( objectArray.find(e => e.name === 'John') )
// expected output { name: 'John' }N
let arr = [
{ name:"string 1", value:"this", other: "that" },
{ name:"string 2", value:"this", other: "that" }
];
let obj = arr.find(o => o.name === 'string 1');
console.log(obj);N
var __POSTS = [
{ id: 1, title: 'Apple', description: 'Description of post 1' },
{ id: 2, title: 'Orange', description: 'Description of post 2' },
{ id: 3, title: 'Guava', description: 'Description of post 3' },
{ id: 4, title: 'Banana', description: 'Description of post 4' }
];
var __FOUND = __POSTS.find(function(post, index) {
if(post.title == 'Guava')
return true;
});
// On success __FOUND will contain the complete element (an object)
// On failure it will contain undefined
console.log(__FOUND); // { id: 3, title: 'Guava', description: 'Description of post 3' }
N
const employees = [
{ name: "David Carlson", age: 30 },
{ name: "John Cena", age: 34 },
{ name: "Mike Sheridan", age: 25 },
{ name: "John Carte", age: 50 }
];
let user;
for(let i = 0; i < employees.length; i++) {
if(employees[i].name.indexOf('John') > -1) {
user = employees[i];
break;
}
}
console.log(user); // { name: "John Cena", age: 34 }
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