Run results for: Spread vs object.assing vs forEach pt4

Test name	Executions per second
Spread	1397394.9 Ops/sec
Object.assign	2380346.5 Ops/sec
Foreach	2271430.2 Ops/sec
just for	6748000.0 Ops/sec

Spread

const a = {
    email: "abc@mail.com",
    phone: "12345678",
};

const b = {
    app_version: "AP.12",
    appsflyer_id: "askldjajkshdlkjh2323h4234j2l3j4h",
    advertising_id: "23;o4h2l34hl2kj3h4kj23h4",
    device_os_version: "12",
    device_name: "Aifon 15 PRO",
    firebase_instance_id: "2liu3hiuo23y4u23y4ui2y34iy3u4y234",
};

const c = {
  first_name: "lalala",
  last_name: "dadada"
};

let res = {
    email: null,
    phone: null,
    last_name: null,
    first_name: null,
    app_version: null,
    appsflyer_id: null,
    advertising_id: null,
    device_os_version: null,
    device_name: null,
    firebase_instance_id: null,
    ...a
};
  
res = {
      email: null,
    phone: null,
    last_name: null,
    first_name: null,
    app_version: null,
    appsflyer_id: null,
    advertising_id: null,
    device_os_version: null,
    device_name: null,
    firebase_instance_id: null,
    ...res,
    ...b
};

res = {
    email: null,
    phone: null,
    last_name: null,
    first_name: null,
    app_version: null,
    appsflyer_id: null,
    advertising_id: null,
    device_os_version: null,
    device_name: null,
    firebase_instance_id: null,
    ...res,
    ...c
}

Object.assign

const a = {
    email: "abc@mail.com",
    phone: "12345678",
};

const b = {
    app_version: "AP.12",
    appsflyer_id: "askldjajkshdlkjh2323h4234j2l3j4h",
    advertising_id: "23;o4h2l34hl2kj3h4kj23h4",
    device_os_version: "12",
    device_name: "Aifon 15 PRO",
    firebase_instance_id: "2liu3hiuo23y4u23y4ui2y34iy3u4y234",
};

const c = {
  first_name: "lalala",
  last_name: "dadada"
};

let res = {
    email: null,
    phone: null,
    last_name: null,
    first_name: null,
    app_version: null,
    appsflyer_id: null,
    advertising_id: null,
    device_os_version: null,
    device_name: null,
    firebase_instance_id: null,
    ...a
};
                          
Object.assign(res, b);
Object.assign(res, c);

Foreach

const a = {
      email: "abc@mail.com",
      phone: "12345678",
};

const b = {
    app_version: "AP.12",
    appsflyer_id: "askldjajkshdlkjh2323h4234j2l3j4h",
    advertising_id: "23;o4h2l34hl2kj3h4kj23h4",
    device_os_version: "12",
    device_name: "Aifon 15 PRO",
    firebase_instance_id: "2liu3hiuo23y4u23y4ui2y34iy3u4y234",
};

const c = {
  first_name: "lalala",
  last_name: "dadada"
};

const res = {
      email: null,
      phone: null,
      last_name: null,
      first_name: null,
      app_version: null,
      appsflyer_id: null,
      advertising_id: null,
      device_os_version: null,
      device_name: null,
      firebase_instance_id: null,
  	  ...a
};

Object.keys(b).forEach(key => {
    res[key] = b[key];
  });
Object.keys(c).forEach(key => {
    res[key] = c[key];
  });

just for

const a = {
      email: "abc@mail.com",
      phone: "12345678",
};

const b = {
    app_version: "AP.12",
    appsflyer_id: "askldjajkshdlkjh2323h4234j2l3j4h",
    advertising_id: "23;o4h2l34hl2kj3h4kj23h4",
    device_os_version: "12",
    device_name: "Aifon 15 PRO",
    firebase_instance_id: "2liu3hiuo23y4u23y4ui2y34iy3u4y234",
};

const c = {
  first_name: "lalala",
  last_name: "dadada"
};

const res = {
      email: null,
      phone: null,
      last_name: null,
      first_name: null,
      app_version: null,
      appsflyer_id: null,
      advertising_id: null,
      device_os_version: null,
      device_name: null,
      firebase_instance_id: null,
      ...a
};

for (const key in b) {
	res[key] = b[key];
}

for (const key in c) {
	res[key] = c[key];
}