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StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
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1.2
2025-09-02
原作者网页列出 Replace、Index、Email、InetAddress 函数；当前随文档下载的 .aix 仍为 1.1，暂未包含这些成员
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示例应用
参考
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UITableView set to static cells. Is it possible to hide some of the cells programmatically?
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Objective-C:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [super tableView:tableView cellForRowAtIndexPath:indexPath];
if(cell == self.cellYouWantToHide)
return 0; //set the hidden cell's height to 0
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What's the Point of Multiple Redis Databases?
...eys command. You'll find far better performance if you simply create a key index. Whenever adding a key, add the key name to a set. The keys command is not terribly useful once you scale up since it will take significant time to return.
Let the access pattern determine how to structure your data r...
Rotating a two-dimensional array in Python
...ar what zip does, it will group elements from each input iterable based on index, or in other words it groups the columns.
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UITableView with fixed section headers
...ate design. (such as height of header for sections & height of cell at index path, sections)
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Generator Expressions vs. List Comprehension
...thing in get_some_stuff())
print gen()[:2] # generators don't support indexing or slicing
print [5,6] + gen() # generators can't be added to lists
Basically, use a generator expression if all you're doing is iterating once. If you want to store and use the generated results, then you're prob...
Is having an 'OR' in an INNER JOIN condition a bad idea?
...e WHERE parentId = 1 OR id = 2 will use a concatenation if both fields are indexed so theoretically there is nothing that would prevent doing the same thing in a loop. Whether SQL Server will build this plan actually or not, depends on very many factors, but I've never seen it built in real life.
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Rails detect if request was AJAX
... But its okey to be truthy, the zero means that the text is found at index 0, so its found (and its and ajax request). If text is not found the result is nil, which is false.
– Arnold Roa
Aug 24 '17 at 0:47
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Change Bootstrap tooltip color
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Here is tooltip code in boostrap...
.tooltip {
position: absolute;
z-index: 1070;
display: block;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 12px;
font-style: normal;
font-weight: normal;
line-height: 1.42857143;
text-align: left;
text-align: start;...
Unusual shape of a textarea?
...px solid lightBlue;
}
#box-a {
top: 10px;
background: #fff;
z-index: 1;
border-bottom: none;
}
#box-b {
top: 210px;
width: 400px;
overflow: auto;
margin-top: -2px;
}
The result:
For more info about regions - here's a good aricle: CSS3 regions: Rich page layout ...