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(![]+[])[+[]]… Explain why this works
..., for example.
![]; // false, it was truthy
!{}; // false, it was truthy
!0; // true, it was falsey
!NaN; // true, it was falsey
After it, we have the second operand of the addition, an empty Array, [], this is made just to convert the false value to String, because the string representation of...
How to find out the number of CPUs using python
...thony Sottile
33.3k99 gold badges6666 silver badges100100 bronze badges
answered Jun 17 '09 at 10:53
Nadia AlramliNadia Alramli
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Blocks on Swift (animateWithDuration:animations:completion:)
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202
the completion parameter in animateWithDuration takes a block which takes one boolean parameter...
How to format numbers as currency string?
...ofits.toFixed(2) //returns 2489.82
profits.toFixed(7) //returns 2489.8237000 (pads the decimals)
All you need is to add the currency symbol (e.g. "$" + profits.toFixed(2)) and you will have your amount in dollars.
Custom function
If you require the use of , between each digit, you can use this...
获取文件系统映像及恢复删除的数据（FAT文件系统格式描述） - C/C++ - 清泛...
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偏移量
字段描述
必须 的 ？
0-2
启动文件系统载入器 (loader)的 汇编代码 (即转到 loader 的起始位置 )
不
3-10
操作系统名称 ( ASCII 形式 )
不
11-12
磁盘扇...
How can I get a count of the total number of digits in a number?
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Without converting to a string you could try:
Math.Ceiling(Math.Log10(n));
Correction following ysap's comment:
Math.Floor(Math.Log10(n) + 1);
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\d is less efficient than [0-9]
I made a comment yesterday on an answer where someone had used [0123456789] in a regular expression rather than [0-9] or \d . I said it was probably more efficient to use a range or digit specifier than a character set.
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How to use php serialize() and unserialize()
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10 Answers
10
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Comparing two CGRects
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250
Use this:
if (CGRectEqualToRect(self.view.frame, rect)) {
// do some stuff
}
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Textarea Auto height [duplicate]
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autosize(document.getElementById("note"));
textarea#note {
width:100%;
box-sizing:border-box;
direction:rtl;
display:block;
max-width:100%;
line-height:1.5;
padding:15px 15px 30px;
border-radius:3px;
border:1px solid #F7E98D;
font:13px Tahoma, cursive;
transition:box-sha...