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Sheng Chuan (Michael) Hsu tpps88206

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tpps88206 / README.txt
Created January 23, 2022 17:04
Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=
REMIX EXAMPLE PROJECT
Remix example project is present when Remix loads very first time or there are no files existing in the File Explorer.
It contains 3 directories:
1. 'contracts': Holds three contracts with different complexity level, denoted with number prefix in file name.
2. 'scripts': Holds two scripts to deploy a contract. It is explained below.
3. 'tests': Contains one test file for 'Ballot' contract with unit tests in Solidity.
SCRIPTS
@tpps88206
tpps88206 / index.js
Created December 11, 2020 09:05
在 JavaScript 中實作 debounce 函數
function debounce(fn, delay) {
var timer
return function () {
var context = this
var args = arguments
clearTimeout(timer)
@tpps88206
tpps88206 / index.js
Created December 11, 2020 09:03
在 JavaScript 中實作 concatAll 函數
Array.prototype.concatAll = function() {
var result = [];
// 用 apply 完成
this.forEach((array) => {
result.push.apply(result, array);
});
return result;
};
@tpps88206
tpps88206 / index.js
Created December 11, 2020 09:00
在 JavaScript 中實作 filter 函數
Array.prototype.filter = function(callback) {
var result = [];
this.forEach((item, index) => {
if(callback(item, index))
result.push(item);
});
return result;
}
@tpps88206
tpps88206 / index.js
Created December 11, 2020 09:00
在 JavaScript 中實作 map 函數
Array.prototype.map = function(callback) {
var result = [];
this.forEach(function(element, index) {
result.push(callback(element, index));
})
return result;
}
@tpps88206
tpps88206 / index.js
Created December 7, 2020 17:11
在 JavaScript 中實作 Promise.race() 的方法
function promiseRace(promises) {
if (!Array.isArray(promises)) {
throw new Error("promises must be an array")
}
return new Promise(function (resolve, reject) {
promises.forEach(p =>
Promise.resolve(p).then(data => {
resolve(data)
}, err => {
reject(err)
@tpps88206
tpps88206 / index.js
Last active December 12, 2020 15:30
在 JavaScript 中實作 Promise.all() 的方法
function promiseAll(promises) {
if (!Array.isArray(promises)) {
throw new Error("promises must be an array")
}
return new Promise(function (resolve, reject) {
let promsieNum = promises.length;
let resolvedCount = 0;
let resolveValues = new Array(promsieNum);
for (let i = 0; i < promsieNum; i++) {
@tpps88206
tpps88206 / index.js
Created December 7, 2020 17:10
在 JavaScript 中實作 Promise 的方法
class Promsie {
constructor(fn) {
this.status = 'pending',
this.resolve = undefined;
this.reject = undefined;
let resolve = value => {
if (this.status === 'pending') {
this.status = 'resolved';
this.resolve = value;
}
@tpps88206
tpps88206 / index.js
Created December 7, 2020 14:36
在 JavaScript 中實作 Flat 函數
const flatten = (input) => {
const stack = [...input];
const result = [];
while (stack.length) {
const next = stack.pop();
if (Array.isArray(next)) {
stack.push(...next);
} else {
result.push(next);
}
@tpps88206
tpps88206 / index.js
Created November 20, 2020 10:36
在 Javascript 中，透過取一個很小的誤差當作容許值，解決 0.1 + 0.2 不等於 0.3 的問題
function equal(n1, n2) {
return Math.abs(n1 - n2) < Number.EPSILON;
}
var a = 0.1 + 0.2;
var b = 0.3;
equal(a, b); // true
equal(0.0000001, 0.0000002); // false