var arrData = ['html', 'css', 'javascript'];
var value = 'css';

console.log(arrData.includes(value));
console.log(arrData.some(item => item === value));
console.log(arrData.indexOf(value) < 0 ? false : true);
console.log(arrData.findIndex(item => item === value) < 0 ? false : true);
console.log(arrData.find(item => item === value) !== undefined ? true : false );

var arrData = [{ name: 'html' }, { name: 'css' }, { name: 'javascript' }];
var value = 'css';

console.log(arrData.some(item => item.name === value));
console.log(arrData.filter(item=> item.name === value)[0] ? true : false);
console.log(arrData.find(item => item.name === value) ? true : false);

var arrData = ['html', 'css', 'javascript', 'css'];

console.log([...new Set(arrData)]);
console.log(Array.from(new Set(arrData)));
console.log(arrData.filter((item, index, slef) => slef.indexOf(item) === index));
console.log(arrData.reduce((prev, cur) => prev.includes(cur) ? prev : [...prev, cur], []));