React Repeater HOC

by Swashata Ghosh on April 2018 ยท 2 minute read
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This came out as a discussion with people from wesbos slack channel.

PS: Do buy his courses, those are just awesome ๐Ÿ”ฅ

The issue at hand was to functionally repeat a react component N times. So I came up with this quick HOC.

import React from 'react';

/**
 * A HOC to repeat a component N times.
 *
 * @param {React.Component} Component The original component
 * @param {Number} times How many times it has to be repeated
 * @param {String} keyPrefix The prefix for the key and index
 */
const Repeater = (Component, times = 1, keyPrefix = 'rp') => props => {
	const Repeated = [];
	Repeated.length = times;
	Repeated.fill(Component);
	return (
		<div className="repeater">
			{Repeated.map((Com, index) => (
				<Com
					{...props}
					key={`${keyPrefix}-${index}`}
					index={`${keyPrefix}-${index}`}
					num={index}
				/>
			))}
		</div>
	);
};

export default Repeater;

It accepts three parameters, the Component, how many times and a keyPrefix to dynamically create a Key (Maybe this is a bad idea, but if you have something better let me know).

Use it like this.

import React from 'react';
import PropTypes from 'prop-types';

import Repeater from './Repeater';

const Foo = props => (
	<div className="wpq-eform-foo">
		<h2 className="wpq-eform-foo__title">Hello World {props.num}</h2>
		<p className="wpq-eform-foo__description">I am number {props.num}</p>
		<div className="wpq-eform-foo__cool">
			{props.cool ? 'I am cool' : 'I am not cool'}
		</div>
	</div>
);
Foo.propTypes = {
	cool: PropTypes.bool.isRequired,
};

const RepeatStuff = props => {
	const RepeatedFoo = Repeater(Foo, props.times, props.keyPrefix);
	return (
		<div className="repeated-item">
			<RepeatedFoo cool />
		</div>
	)
};

RepeatStuff.propTypes = {
	times: PropTypes.number.isRequired,
	keyPrefix: PropTypes.string.isRequired,
};


export default RepeatStuff;

Hope it helps.