JAVASCRIPT

add key vakue to front of object

let obj = {'b': 2, 'c': 3};
Object.assign({a: 1}, obj);

// Object {a: 1, b: 2, c: 3}

add key vakue to front of object

var arr = [
    { key: 'b', value: 2 },
    { key: 'c', value: 3 }
];