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App Inventor 2 自定义拍照及录像媒体文件的路径，进行目录规整 · App Inventor 2 中文网
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How can I find the number of days between two Date objects in Ruby?
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edited Dec 16 '13 at 6:29
dylanfm
6,12055 gold badges2424 silver badges2727 bronze badges
answered De...
Detect URLs in text with JavaScript
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222
First you need a good regex that matches urls. This is hard to do. See here, here and here:
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Converting JavaScript object with numeric keys into array
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328
It's actually very straight forward with jQuery's $.map
var arr = $.map(obj, function(el) { re...
Find object in list that has attribute equal to some value (that meets any condition)
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edited Sep 20 at 6:28
Tropicalrambler
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answered Aug ...
How to install 2 Anacondas (Python 2 and 3) on Mac OS
...m wondering how to install properly second Anaconda (for work) with Python 2?
3 Answers
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How does zip(*[iter(s)]*n) work in Python?
...s to zip(), and it pulls an item from the iterator each time.
x = iter([1,2,3,4,5,6,7,8,9])
print zip(x, x, x)
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Filter dataframe rows if value in column is in a set list of values [duplicate]
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edited Feb 25 at 0:45
Harvey
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Select multiple columns in data.table by their numeric indices
...llowing all just work:
library(data.table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by name
dt[, "a"]
# a
# 1: 1
# select multiple columns by name
dt[, ...