编辑代码

const a1 = Array.from('hello');
console.log(a1);

const b1 = ['a', , 'b'].filter(x => true);
console.log(b1)

const c1 = ['b', 'a'].every(x => x === 'a');
console.log(c1)

const d1 = [, 'a', undefined, null].toString();
console.log(d1)

let [a2, ...b2] = [1, 2, 34, 5, 6, 7];
console.log(b2)

let obj = { p: ['hello', { y: 'world' }] };
let { p, p: [x, { y }] } = obj;
console.log(p, x, y)

let x1;
({ x1 } = { x1: 1 });
console.log(x1)

const node = {
    loc: {
        start: {
            line: 1,
            column: 5
        }
    }
};

let { loc, loc: { start }, loc: { start: { line, column } } } = node;
console.log(loc, start, line, column)

const foo = 'bar';
const baz = {[foo]:'abc'};
console.log(baz)