Functional coding interview questions have a nice property: you can show your work by first expressing what you are trying to achieve in plain English, then writing an unit test, and then coding the solution. The result as you can see is almost 1 to 1 mapping from plain Englis...
六 Consider the two functions below. Will they both return the same thing? Why or why not? 复制代码functionfoo1(){return{ bar:"hello"}; }functionfoo2(){return{ bar:"hello"}; } 执行以上两个函数,会返回相同的东西吗? 不会,第二个函数会返回undefined。这是由于 Javascript 的封号插入机制决定...
View the answer → Consider the two functions below. Will they both return the same thing? Why or why not? function foo1() { return { bar: "hello" }; } function foo2() { return { bar: "hello" }; } View the answer → What is NaN? What is its type? How can you reliabl...
A callback is a function that executes after another function has finished executing. It’s passed to the function as a parameter. Callbacks are necessary because JavaScript is an event-based language that can execute code asynchronously. Callback functions ensure that function calls occur in a sp...
How many types of functions JavaScript supports? JavaScript中的函数可以命名或匿名。 How to define a anonymous function? 可以使用与普通函数类似的方式定义匿名函数,但是它没有任何名称。 Can you assign a anonymous function to a variable? 是!可以将匿名函数分配给变量。
In this guide, we’ll go through some of the common gotchas that you might find in a JavaScript interview. Interviewers probably won’t directly ask these questions, but they might ask you something relative to them or to do a problem involving them. ...
In this free email course, I'll teach you the right way of thinking for breaking down tricky algorithmic coding interview questions. No CS degree necessary. No spam, ever. You've got the JavaScript fundamentals down—variables, functions, and DOM manipulation. You might even think JavaScript...
Consider the two functions below. Will they both return the same thing? Why or why not? function foo1() { return { bar: "hello" }; } function foo2() { return { bar: "hello" }; } View answer Surprisingly, these two functions will not return the same thing. Rather: console.log...
keywordvarshould always be used when defining variables, and an anonymous function should be used as a closure if need be, encapsulating multiple functions which can share access to the same set of variables. That makes sure the variables stay sandboxed, accessible only by those functions which ...
interaction make for easier maintenance. One listener at a container level can handle multiple different event operations. This is not an excuse for a monolithic function of titanic proportions. It is an easy way to manage related events that often perform related functions or need to share data...