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Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...教程,分享给大家 原文地址:http://gashero.iteye.com/blog/2075324 目录 1 简介 2 Swift入门 3 简单值 4 控制流 5 函数与闭包 6 对象与类 7 枚举与结构 1 简介 今天凌晨Apple刚刚发布了Swift编程语言,本文从其发布...
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How to get execution time in rails console?

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Convert a PHP object to an associative array

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Finding the index of elements based on a condition using python list comprehension

... of a list. >>> import numpy >>> a = numpy.array([1, 2, 3, 1, 2, 3]) >>> a array([1, 2, 3, 1, 2, 3]) >>> numpy.where(a > 2) (array([2, 5]),) >>> a > 2 array([False, False, True, False, False, True], dtype=bool) >>> a[numpy.where(a > 2...
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What is the best regular expression to check if a string is a valid URL?

... wrote my URL (actually IRI, internationalized) pattern to comply with RFC 3987 (http://www.faqs.org/rfcs/rfc3987.html). These are in PCRE syntax. For absolute IRIs (internationalized): /^[a-z](?:[-a-z0-9\+\.])*:(?:\/\/(?:(?:%[0-9a-f][0-9a-f]|[-a-z0-9\._~\x{A0}-\x{D7FF}\x{F900}-\x{FDCF}\x{FDF0}-\x...
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How to extend an existing JavaScript array with another array, without creating a new array

... 1553 The .push method can take multiple arguments. You can use the spread operator to pass all the el...
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iPhone Simulator location

... 143 Simulator: ~/Library/Application Support/iPhone Simulator/ You can browse simulator files from ...
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Getting parts of a URL (Regex)

... 153 A single regex to parse and breakup a full URL including query parameters and anchors e.g...
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How to make a flat list out of list of lists?

...e the timeit module in the standard library: $ python -mtimeit -s'l=[[1,2,3],[4,5,6], [7], [8,9]]*99' '[item for sublist in l for item in sublist]' 10000 loops, best of 3: 143 usec per loop $ python -mtimeit -s'l=[[1,2,3],[4,5,6], [7], [8,9]]*99' 'sum(l, [])' 1000 loops, best of 3: 969 usec per loo...
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How to compare two floating point numbers in Bash?

...s in scientific format, provided a capital letter E is employed, e.g. num1=3.44E6 share | improve this answer | follow | ...