blocks|key|4485535|text|阅读代码时，我假设禁止可以有1个以上的字符。我还假设输出应该是"12345“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485536|var+string+=+"12=34-5";

var+forbidden+=+"=-";

console.log(string.split("").filter(function(str){
++++return+forbidden.indexOf(str)+<+0;
}).join(""))|code-block|syntax|javascript|4485537|如果输出为“%251”“%252”“%253”“%254”“%255|4485538|var+string+=+"12=34-5";

var+forbidden+=+"=-";

string.split("").forEach(function(str){
++++if+(forbidden.indexOf(str)+<+0)+{
++++++++console.log(str);
++++}
});|4485539|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Reading the code, I assume forbidden can have more than 1 character. I'm also assuming the output should be "12345"

<pre><code>var string = "12=34-5";

var forbidden = "=-";

console.log(string.split("").filter(function(str){
 return forbidden.indexOf(str) &lt; 0;
}).join(""))
</code></pre>

If the output is "1" "2" "3" "4" "5" on separate lines

<pre><code>var string = "12=34-5";

var forbidden = "=-";

string.split("").forEach(function(str){
 if (forbidden.indexOf(str) &lt; 0) {
 console.log(str);
 }
});
</code></pre>

blocks|key|4485501|text|不是直接的，但是复制起来并不难。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485502|var+string+=+"1234-5";

var+forbidden+=+"-";

string.split("").filter(function(str){
++++if(forbidden.indexOf(str)+<+0)+{
++++++++return+str;
++++}
}).forEach(function(letter)+{+console.log(letter);});|code-block|syntax|javascript|4485503|我猜更直接的是：|4485504|for(var+i=0+;+i+<+str.length+;+i%2B%2B)+{
++++if(forbidden.indexOf(str)+<+0)+{
++++++++console.log(str[i]);
++++}
}|4485505|但是没有内置的方法来过滤你的for循环。|4485506|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Not directly, but it's not hard to replicate.

<pre><code>var string = "1234-5";

var forbidden = "-";

string.split("").filter(function(str){
 if(forbidden.indexOf(str) &lt; 0) {
 return str;
 }
}).forEach(function(letter) { console.log(letter);});
</code></pre>

I guess more directly:

<pre><code>for(var i=0 ; i &lt; str.length ; i++) {
 if(forbidden.indexOf(str) &lt; 0) {
 console.log(str[i]);
 }
}
</code></pre>

But there's no built in way to filter in your for loop.

blocks|key|4485646|text|您可以使用应用程序函数器轻松实现此行为。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485647|Array.prototype.ap+=+function(xs)+{
++return+this.reduce((acc,+f)+=>+acc.concat(xs.map(f)),+[])+
}


const+result+=+[x+=>+x+%2B1].ap([2])
console.log(result)|code-block|syntax|javascript|4485648|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could easily achieve this behavior using an application functor.

<pre><code>Array.prototype.ap = function(xs) {
 return this.reduce((acc, f) =&gt; acc.concat(xs.map(f)), []) 
}


const result = [x =&gt; x +1].ap([2])
console.log(result)
</code></pre>

blocks|key|4486645|text|JavaScript不再支持数组解释。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4486646|我也在寻找JavaScript的等价物。Mozilla+Developer's+Network+indicates+that+this+functionality+is+no+longer+supported.在上面的链接中引用了首选语法。|offset|length|4486647|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Array_comprehensions^0|0|14|1T|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

JavaScript no longer supports array comprehensions.

I too was looking for the JavaScript equivalent. Mozilla Developer's <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Array_comprehensions" rel="nofollow noreferrer">Network indicates that this functionality is no longer supported.</a>
The preferred syntax is referenced in the aforementioned link.

blocks|key|4486573|text|对于“完整性”-sake，这里有一个更短的regexp版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4486574|var+str+=++"1234-5";
var+ignore+=+"-=";

console.log(str.replace(new+RegExp(ignore.split("").join("%7C")),+"").split(""));|code-block|syntax|javascript|4486575|编辑:为了确保RegExp不会被特殊字符“卡住”，可以将ignore实现为正则表达式，而不是字符串：|offset|length|style|CODE|4486576|var+str+=++"1234-5";
var+ignore+=+/[\%2B=-]/;
console.log(str.replace(ignore,+"").split(""));|4486577|entityMap^0|0|0|S|6|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

For "completeness"-sake, here's a shorter regexp version.

<pre><code>var str = "1234-5";
var ignore = "-=";

console.log(str.replace(new RegExp(ignore.split("").join("|")), "").split(""));
</code></pre>

EDIT: To make sure that RegExp does not "choke" on special characters, <code>ignore</code> can be implemented as regexp literal, instead of a string:

<pre><code>var str = "1234-5";
var ignore = /[\+=-]/;
console.log(str.replace(ignore, "").split(""));
</code></pre>

blocks|key|4485613|text|它确实有一个可怜的版本|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4485614|const+string+=+'1234-5'

const+forbidden+=+'-'

print([int(i)+for+i+in+str(string)+if+i+not+in+forbidden])
const+result+=+string.split('').filter(char+=>+char+!==+forbidden);
console.log(result)|code-block|syntax|javascript|4485615|在JS中，您只能迭代数组中的单个元素，因此不能像在Python中那样一次提取多个条目。|4485616|对于这种特殊情况，您应该使用RegExp来过滤字符串。|4485617|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

It does have a poor mans version

<pre><code>const string = '1234-5'

const forbidden = '-'

print([int(i) for i in str(string) if i not in forbidden])
const result = string.split('').filter(char =&gt; char !== forbidden);
console.log(result)
</code></pre>

In JS you can only iterate over single elements in array, so no extraction of multiple entries at a time like in Python.

For this particular case you should use a RegExp to filter the string though.

blocks|key|4485747|text|你可以看看CoffeeScript。CoffeeScript将缺少的特性添加到java-script中，并允许您编写更干净、更具可读性的代码。https://coffeescript.org/#coffeescript-2|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4485748|您编写一个.coffee文件，并且咖啡脚本编译器将您的咖啡文件编译成JavaScript文件。因为到JavaScript的转换是通过编译进行的，所以脚本的运行速度不应该变慢。|4485749|因此，您的代码将类似于咖啡脚本中的以下代码：|4485750|string+=+'1234-5'

forbidden+=+'-'

alert(JSON.stringify(%2Bi+for+i+in+string+when+i+isnt+forbidden))|code-block|syntax|javascript|4485751|老实说，这比python的对应物更容易阅读。并且它会很快编译成休眠的JavaScript：|4485752|var+forbidden,+i,+string;

string+=+'1234-5';

forbidden+=+'-';

alert(JSON.stringify((function()+{
++var+j,+len,+results;
++results+=+[];
++for+(j+=+0,+len+=+string.length;+j+<+len;+j%2B%2B)+{
++++i+=+string[j];
++++if+(i+!==+forbidden)+{
++++++results.push(%2Bi);
++++}
++}
++return+results;
})()));|4485753|你甚至不需要安装任何东西。在他们的网站上，你可以使用它，它会向你展示翻译后的JavaScript代码。|4485754|entityMap|0|LINK|mutability|MUTABLE|url|https://coffeescript.org/#coffeescript-2^0|1Z|14|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|18|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]]]

You could have a look at CoffeeScript.
CoffeeScript adds missing features to java-script and allows you to write cleaner, more readable code. <a href="https://coffeescript.org/#coffeescript-2" rel="nofollow noreferrer">https://coffeescript.org/#coffeescript-2</a>
You write a .coffee file and the coffeScript-compiler compiles your coffee file into a JavaScript file. Because the translation into JavaScript happens by compiling, the script should not run any slower.
So your code would look like the following in coffee script:
<pre class="lang-coffee prettyprint-override"><code>string = '1234-5'

forbidden = '-'

alert(JSON.stringify(+i for i in string when i isnt forbidden))
</code></pre>
Honestly, this is even easier to read then the python counterpart. And it compiles quickly to the fallowing JavaScript:
<pre class="lang-js prettyprint-override"><code>var forbidden, i, string;

string = '1234-5';

forbidden = '-';

alert(JSON.stringify((function() {
 var j, len, results;
 results = [];
 for (j = 0, len = string.length; j &lt; len; j++) {
 i = string[j];
 if (i !== forbidden) {
 results.push(+i);
 }
 }
 return results;
})()));
</code></pre>
You don’t even need to install anything. On their website you can play around with it, and it will show you the translated JavaScript code.

I'm practicing/studying both JavaScript and Python. I'm wondering if Javascript has the equivalence to this type of coding.

I'm basically trying to get an array from each individual integer from the string for practice purposes. I'm more proficient in Python than JavaScript

Python:

<pre><code>string = '1234-5'

forbidden = '-'

print([int(i) for i in str(string) if i not in forbidden])
</code></pre>

Does Javascript have something similar for me to do above?

Does JavaScript support array/list comprehensions like Python?

编译器

Python

JSON

我正在练习/学习JavaScript和Python。我想知道Javascript是否等同于这种类型的编码。出于练习的目的，我基本上是尝试从字符串中的每个单独的整数中获取一个数组。我对Python比JavaScript更精通Python：string = '1234-5'forbidden = '-'print([int(i) for i in str(string) if i not in for

问JavaScript是否支持像Python这样的数组/列表理解？
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