Actually, there is no difference between them, I make a little project on the CodeSandBox and make two simple components, one of them is the Arrow
component by using arrow function:
import React from 'react';
const MyArrowComponent = () => (
<main>
<h2>Arrow</h2>
</main>
);
export default MyArrowComponent;
And the other is the Declaration
component by using function declaration:
import React from "react";
function MyFunctionComponent() {
return (
<main>
<h2>Declaration</h2>
</main>
);
}
export default MyFunctionComponent;
Then I run the yarn build
command and the got the bundle like below:
(window.webpackJsonp = window.webpackJsonp || []).push([[0], {
14: function (e, n, t) {
"use strict";
t.r(n);
var a = t(0), r = t.n(a), l = t(2),
c = t.n(l), u = t(3), i = t(4), o = t(6), m = t(5), E = t(7);
var p = function () {
return r.a.createElement("main", null, r.a.createElement("h2", null, "Declaration"))
}, s = function () {
return r.a.createElement("main", null, r.a.createElement("h2", null, "Arrow"))
}, d = function (e) {
function n() {
return (
Object(u.a)(this, n),
Object(o.a)(this, Object(m.a)(n).apply(this, arguments))
}
return Object(E.a)(n, e), Object(i.a)(n, [{
key: "render", value: function () {
return r.a.createElement(
'div',
null,
r.a.createElement('div', null, 'Hi'),
r.a.createElement(p, null),
r.a.createElement(s, null)
);
}
}]), n
}(r.a.Component);
c.a.render(r.a.createElement(d, null), document.getElementById("root"))
}, 8: function (e, n, t) {
e.exports = t(14)
}
}, [[8, 1, 2]]]);
Pay attention to the definition of the Arrow
and the Declaration
component:
var p = function () {
return r.a.createElement("main", null, r.a.createElement("h2", null, "Declaration"))
}, s = function () {
return r.a.createElement("main", null, r.a.createElement("h2", null, "Arrow"))
}
Both of them defined in the same way, so definitely there is no difference between them and it is fully opinion based for developers' attitude to code readability and clean code, based on ESLint 5.x in our team we choose the arrow function to define the functional components.