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What are the rules for JavaScript's automatic semicolon insertion (ASI)?

Well, first I should probably ask if this is browser dependent. I've read that if an invalid token is found, ... have a more in-depth description of the rules? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How can I merge properties of two JavaScript objects dynamically?

I need to be able to merge two (very simple) JavaScript objects at runtime. For example I'd like to: var ... to merge functions, just methods on flat objects. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Int division: Why is the result of 1/3 == 0?

I was writing this code: public static void main(String[] args) { double g = 1 / 3; System.out.printf("%.2f", ... Why is this, and how do I solve this problem? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Sort ArrayList of custom Objects by property

I read about sorting ArrayLists using a Comparator but in all of the examples people used compareTo which according ... .arrayList, new CustomComparator); ... } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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formatting - How to print a number with commas as thousands separators in JavaScript

I am trying to print an integer in JavaScript with commas as thousands separators. For example, I want to ... -specific to decide between periods and commas. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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109 views

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html - How can I change an element's class with JavaScript?

How can I change the class of an HTML element in response to an onclick or any other events using JavaScript? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Using fflush(stdin)

So a quick Google search for fflush(stdin) for clearing the input buffer reveals numerous websites warning against ... it and it seems to work flawlessly? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - Grouping functions (tapply, by, aggregate) and the *apply family

Whenever I want to do something "map"py in R, I usually try to use a function in the apply family. ... would plyr or reshape replace all of these entirely? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - srand() — why call it only once?

This question is about a comment in this question Recommended way to initialize srand? The first comment says that srand( ... in an application. Why is it so? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - How do you access the matched groups in a JavaScript regular expression?

I want to match a portion of a string using a regular expression and then access that parenthesized substring: var ... ]); // Prints: format_undefined (!!!) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How can I do a FULL OUTER JOIN in MySQL?

I want to do a full outer join in MySQL. Is this possible? Is a full outer join supported by MySQL? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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When to use LinkedList over ArrayList in Java?

I've always been one to simply use: List<String> names = new ArrayList<>(); I use the interface as ... should LinkedList be used over ArrayList and vice-versa? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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202 views

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How to randomize (shuffle) a JavaScript array?

I have an array like this: var arr1 = ["a", "b", "c", "d"]; How can I randomize / shuffle it? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Prototypical inheritance - writing up

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asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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192 views

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c++ - What are copy elision and return value optimization?

What is copy elision? What is (named) return value optimization? What do they imply? In what situations can ... the standard reference. See common cases here. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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128 views

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php - The 3 different equals

What is the difference between =, ==, and ===? I think using one equal sign is to declare a ... equal signs are for comparing values of declared variables. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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277 views

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Compare two dates with JavaScript

Can someone suggest a way to compare the values of two dates greater than, less than, and not in the past using ... ? The values will be coming from text boxes. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

1 answer

html - Image inside div has extra space below the image

Why in the following code the height of the div is bigger than the height of the img ? There is a gap below the image ... ://i.imgur.com/RECDV24.jpg" /> </div> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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195 views

1 answer

java - Non-static variable cannot be referenced from a static context

I've written this test code: class MyProgram { int count = 0; public static void main(String[] args) { ... I get my methods to recognize my class variables? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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70 views

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javascript - jQuery Ajax POST example with PHP

I am trying to send data from a form to a database. Here is the form I am using: <form name="foo" action="form ... it to a PHP script (an example, form.php)? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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184 views

1 answer

language agnostic - Why are floating point numbers inaccurate?

Why do some numbers lose accuracy when stored as floating point numbers? For example, the decimal number 9.2 can be ... big" to express in 64 bits of memory? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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74 views

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python - How to convert string representation of list to a list?

I was wondering what the simplest way is to convert a string representation of a list like the following to a list: ... a quick function that I'm not aware of? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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251 views

1 answer

python - How to iterate through two lists in parallel?

I have two iterables in Python, and I want to go over them in pairs: foo = (1, 2, 3) bar = (4, 5, ... unpythonic to me. Is there a better way to do it? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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127 views

1 answer

language agnostic - What does it mean to "program to an interface"?

I have seen this mentioned a few times and I am not clear on what it means. When and why would you ... object that implements an interface? Is that possible? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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154 views

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c# - What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?

I have some code and when it executes, it throws a IndexOutOfRangeException, saying, Index was outside the bounds ... and less than the size of the collection. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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292 views

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linux - When should I wrap quotes around a shell variable?

Should or should I not wrap quotes around variables in a shell script? For example, is the following correct: xdg-open $URL [ $ ... ?" -eq "2" ] And if so, why? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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147 views

1 answer

My regex is matching too much. How do I make it stop?

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asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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181 views

1 answer

java - How to upload files to server using JSP/Servlet?

How can I upload files to server using JSP/Servlet? I tried this: <form action="upload" method="post"> <input ... 489) at java.lang.Thread.run(Thread.java:637) Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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