Ekrem ekrem-aktas

Daily code reader for 20 years & will read more thanks to GenAI.

ekrem-aktas / username_validation_composed.js

Last active April 29, 2023 14:43

	// Returns a function which runs given checkFn against a value.
	const createRule = (checkFn, errorMessage) => {
	return async (value) => await Promise.resolve(checkFn(value)) ? null : errorMessage;
	}

	// Returns a function which accepts a value to validate and runs all passed rules.
	const defineValidator = (...rules) => {
	return async (value) => {
	for (const rule of rules) {
	const errorMessage = await rule(value);

ekrem-aktas / username_validation_no_network.js

Last active January 7, 2021 08:26

	async function isUsernameAvailable(username) {
	const response = await fetch(`/api/checkusername/${username}`); // returns { available: true \| false }
	return (await response.json()).available;
	}

	async function validateUsername(username, usernameUniquenessCheckFn) {
	if (typeof username !== "string" \|\| username.trim() === "") {
	return { valid: false, reason: "Username is needed" };
	}

ekrem-aktas / username_validation_no_dom_effects.js

Last active January 7, 2021 08:27

	async function validateUsername(username) {
	if (typeof username !== "string" \|\| username.trim() === "") {
	return { valid: false, reason: "Username is needed" };
	}

	if (!username.match(/^\w+$/)) {
	return { valid: false, reason: "Username must consist of characters and numbers" };
	}

	const response = await fetch(`/api/checkusername/${username}`); // returns { available: true \| false }

ekrem-aktas / username_validation_native.js

Created October 6, 2020 20:20

	async function validateUsername(username) {
	const errorNode = document.getElementById("error-text");

	// Check if username is a non-empty string
	if (typeof username !== "string" \|\| username.trim() === "") {
	errorNode.innerText = "Username is required";
	return false;
	}

	// Check if username format is valid

ekrem-aktas / group_objects_with_foreach.js

Created September 24, 2020 12:19

	function groupBy(arr, func){
	let grouped = Object.create(null);

	arr.forEach((item) => {
	const key = func(item);
	if (!grouped[key]) {
	grouped[key] = [];
	}
	grouped[key].push(item);
	});

ekrem-aktas / group_objects_with_reduce.js

Created September 24, 2020 12:18

ekrem-aktas / create_object_from_array_with_foreach.js

Created September 24, 2020 12:18

	const members = [["name", "apple"], ["type", "fruit"]];

	const obj = Object.create(null);
	members.forEach(([key, value]) => obj[key] = value);

	console.log(obj); // { name: "apple", type: "fruit" }

ekrem-aktas / create_object_from_array_with_reduce.js

Created September 24, 2020 12:17

	const members = [["name", "apple"], ["type", "fruit"]];

	const food = members.reduce((obj, [key, value]) => {
	obj[key] = value;
	return obj;
	}, Object.create(null));

	console.log(food); // { name: "apple", type: "fruit" }

ekrem-aktas / sum_numbers_with_foreach.js

Created September 24, 2020 12:16

	const numbers = [1, 2, 3];

	let total = 0;
	numbers.forEach(num => total += num);

	console.log(total) // 6

ekrem-aktas / sum_numbers_with_reduce.js

Created September 24, 2020 12:15

	const numbers = [1, 2, 3];
	const total = numbers.reduce((sum, num) => sum + num);

	console.log(total); // 6