Tec Zoom

题目：Return the number (count) of vowels in the given string.We will consider a, e, i, o, and u as vowels for this Kata.The input string will only consist of lower case letters and/or spaces.个人感觉较好的...

题目：In this kata, we will make a function to test whether a period is late.Our function will take three parameters:last - The Date object with the date of the last periodtoday - The Date object wit...

题目：For every good kata idea there seem to be quite a few bad ones!In this kata you need to check the provided array (x) for good ideas ‘good’ and bad ideas ‘bad’. If there are one or two good ideas,...

题目：Simple, remove the spaces from the string, then return the resultant string.个人感觉不错的解答：function noSpace(x){ return x.replace(/\s/g, '');}function noSpace(x){return x.split(' ').join('')}co...

题目：Implement a function named generateRange(min, max, step), which takes three arguments and generates a range of integers from min to max, with the step. The first integer is the minimum value, the ...

https://www.cnblogs.com/chenjg/p/7158248.html

在正则表达式中，当你在表达式加入问号时，就意味着这个表达式是可选的。<Route path="/posts/:year?/:month?" component={Posts} />

类假值（Falsy）：undefined、null、’’、false、0、NaN类真值（Truthy）：所有不是类假值的值false || 1 || 2：1（运算从第一个参数开始，只要遇到它第一个类真值，它就返回，即短路（就近原则））使用位元或‘|’运算符可以添加权限，使用位元与‘&’运算符可以检测是否有某个权限当js编译器处理一个布尔表达式时：它先看第一个值...

在使用es6中extends继承时，如果在父类中有一个构造器，然后在子类中又想添加一个构造器，在子类中的构造器必须先调用父类的构造器，以创建一个父类的实例。在子类构造器中，我们可以使用super关键字去引用父类实例...

const _radius = new WeakMap();class Circle { constructor(radius) { _radius.set(this, radius); } get radius() { return _radius.get(this); } set radius(value) { ...