// Object.assign
let a = {a: 1, b: 2};
let b = Object.assign({}, a);
// ...
let a = {a: 1, b: 2};
let b = {...a};
// slice
let a = [1, {a: 1}];
let b = a.slice();
// concat
let a = [1, {a: 1}];
let b = [].concat(a);
// Object.assign
let a = {a: 1, b: 2};
let b = Object.assign({}, a);
// ...
let a = {a: 1, b: 2};
let b = {...a};
// slice
let a = [1, {a: 1}];
let b = a.slice();
// concat
let a = [1, {a: 1}];
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