Object.assign(), Spread_syntax, Index Signatures

object.assign.ts

interface Foo {
    readonly bar: number;
    readonly baz: number;
}

const fooArray: Foo[] = [
    { bar: 100, baz: 200 },
    { bar: 300, baz: 400 },
]

console.log(fooArray);
/*
Array(2)
    0: {bar: 100, baz: 200}
    1: {bar: 300, baz: 400}
*/

const fooArray2 = fooArray.map(foo => {
    const obj: any = {};
    obj[foo.bar] = foo.baz;
    return obj
});

console.log(Object.assign({}, ...fooArray2 ));
/*
Object
    100: 200
    300: 400
*/

basではなくbazなような(　´･?･｀)