brackets

difference between dot notation and bracket notation in javascript [duplicate]

由 牧云@^-^@ 提交于 2019-11-26 15:29:20
This question already has an answer here: JavaScript property access: dot notation vs. brackets? 11 answers I am trying to understand the difference between .Notation and [] notation. In my problem below when I use if (object[key] === true) I get the correct answer. When I use if (object.key === true) it does not work. Could someone explain why it's different. var myObj = { one: false, two: false, three: false, four: true, five: false, six: false }; var myFunc = function (object) { for (var key in object) { if (object[key] === true) { return "There is a true value in this object"; } else { } }

Flatten list of lists [duplicate]

由 北城以北 提交于 2019-11-26 14:21:15
This question already has an answer here: Flattening a shallow list in Python [duplicate] 23 answers I'm having a problem with square brackets in Python. I wrote a code that produces the following output: [[180.0], [173.8], [164.2], [156.5], [147.2], [138.2]] But I would like to perform some calculations with that, but the the square brackets won't let me. How can I remove the brackets? I saw some examples to do that but I could not apply them to this case. Flatten the list to "remove the brackets" using a nested list comprehension. This will un-nest each list stored in your list of lists!

Curly Brackets in Arrow Functions

由 别来无恙 提交于 2019-11-26 11:55:42
can someone, please explain the following: I'm following Dan Abramov's lectures & doing the exercises. The code works fine, however, the tests fail when the following particular function is written with curly brackets **{ }** . case 'toggleTodo' : return ( state.map( (one) => { oneTodo( one, action ) }) ); The same code works fine without curly brackets. case 'toggleTodo' : return ( state.map( (one) => oneTodo( one, action ) ) ); Here is the JsBin . Please refer to line 31 onwards. case 'toggleTodo' : return ( state.map( (one) => oneTodo( one, action ) ) ); is equal to: case 'toggleTodo' :

Can I use Perl regular expressions to match balanced text?

由 喜夏-厌秋 提交于 2019-11-26 11:27:22
问题 I would like to match text enclosed in brackets etc in Perl. How can I do that? This is a question from the official perlfaq. We\'re importing the perlfaq to Stack Overflow. 回答1: This is the official FAQ answer minus any subsequent edits. Your first try should probably be the Text::Balanced module, which is in the Perl standard library since Perl 5.8. It has a variety of functions to deal with tricky text. The Regexp::Common module can also help by providing canned patterns you can use. As of

Python parsing bracketed blocks

由 笑着哭i 提交于 2019-11-26 08:14:45
问题 What would be the best way in Python to parse out chunks of text contained in matching brackets? \"{ { a } { b } { { { c } } } }\" should initially return: [ \"{ a } { b } { { { c } } }\" ] putting that as an input should return: [ \"a\", \"b\", \"{ { c } }\" ] which should return: [ \"{ c }\" ] [ \"c\" ] [] 回答1: Pseudocode: For each string in the array: Find the first '{'. If there is none, leave that string alone. Init a counter to 0. For each character in the string: If you see a '{',

PHP conditionals, brackets needed?

由 天大地大妈咪最大 提交于 2019-11-26 07:28:32
问题 I was just browsing a forum and someone asked about a PHP file they had found on the web. It has several spots like this in the code: if ($REMOTE_ADDR == \"\") $ip = \"no ip\"; else $ip = getHostByAddr($REMOTE_ADDR); I have always thought brackets are needed to enclose what you want to do if the condition is true. Is there some other alternative, such as if it is on the same line you don\'t? There is also another line like this: if ($action != \"\"): mail(\"$adminaddress\",\"Visitor Comment

difference between dot notation and bracket notation in javascript [duplicate]

由 Deadly 提交于 2019-11-26 04:27:20
问题 This question already has answers here : JavaScript property access: dot notation vs. brackets? (13 answers) Closed 2 years ago . I am trying to understand the difference between .Notation and [] notation. In my problem below when I use if (object[key] === true) I get the correct answer. When I use if (object.key === true) it does not work. Could someone explain why it\'s different. var myObj = { one: false, two: false, three: false, four: true, five: false, six: false }; var myFunc =

Flatten list of lists [duplicate]

由 若如初见. 提交于 2019-11-26 03:51:19
问题 This question already has an answer here: Flattening a shallow list in Python [duplicate] 23 answers I\'m having a problem with square brackets in Python. I wrote a code that produces the following output: [[180.0], [173.8], [164.2], [156.5], [147.2], [138.2]] But I would like to perform some calculations with that, but the the square brackets won\'t let me. How can I remove the brackets? I saw some examples to do that but I could not apply them to this case. 回答1: Flatten the list to "remove

Curly Brackets in Arrow Functions

由 家住魔仙堡 提交于 2019-11-26 03:34:47
问题 can someone, please explain the following: I\'m following Dan Abramov\'s lectures & doing the exercises. The code works fine, however, the tests fail when the following particular function is written with curly brackets **{ }** . case \'toggleTodo\' : return ( state.map( (one) => { oneTodo( one, action ) }) ); The same code works fine without curly brackets. case \'toggleTodo\' : return ( state.map( (one) => oneTodo( one, action ) ) ); Here is the JsBin. Please refer to line 31 onwards. 回答1:

Is it ok if I omit curly braces in Java? [closed]

由 孤者浪人 提交于 2019-11-25 23:49:47
问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed last year . I\'ve searched for this, but couldn\'t find an answer and for whatever reason I was too ashamed to ask professor, due to that feeling when hundreds of people stare at you... Anyhow, my question is what\'s the importance of having brackets? Is it OK if I omit them? Example: for
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