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What is the difference between map and flatMap and a good use case for each?
...ark-shell session:
First, some data - two lines of text:
val rdd = sc.parallelize(Seq("Roses are red", "Violets are blue")) // lines
rdd.collect
res0: Array[String] = Array("Roses are red", "Violets are blue")
Now, map transforms an RDD of length N into another RDD of length N.
For examp...
How should I edit an Entity Framework connection string?
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I had to explicitly call save on the app.config file for the designer to recognise the connection string had been deleted.
– Rossco
May 9 '14 at 2:37
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Random strings in Python
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In many cases, random isn't really required. Rather, all you really need is unique.
– Chase Seibert
Jan 8 '10 at 19:48
1
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Get city name using geolocation
... as to which one will have the city.
"administrative_area_level_1" is usually what you are looking for but sometimes locality is the city you are after.
Anyhow - more details on google response types can be found here and here.
Below is the code that should do the trick:
<!DOCTYPE html> ...
Rails: How does the respond_to block work?
...html
The Responder does NOT contain a method for .html or .json, but we call these methods anyways! This part threw me for a loop.
Ruby has a feature called method_missing. If you call a method that doesn't exist (like json or html), Ruby calls the method_missing method instead.
http://ruby-meta...
Reload an iframe with jQuery
...tion() {
document.location.reload();
});
and you are good to go with all browsers.
Reload an iframe with HTML (no Java Script req.)
It have more simpler solution: which works without javaScript in (FF, Webkit)
just make an anchor inSide your iframe
<a href="#" target="_SELF">Refre...
App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...a
初始化局部变量 m = 取文本为数字(文本输入框_质量.文本)
初始化局部变量 r = 取文本为数字(文本输入框_半径.文本)
设置 全局变量 向心力 为 m × 全局变量 向心加速度
设置 标...
How to compare arrays in JavaScript?
I'd like to compare two arrays... ideally, efficiently. Nothing fancy, just true if they are identical, and false if not. Not surprisingly, the comparison operator doesn't seem to work.
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Best GWT widget library? [closed]
Question for all the GWT gurus out there - which is the best GWT widgets library out there? And why?
27 Answers
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Transposing a 2D-array in JavaScript
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array[0].map((_, colIndex) => array.map(row => row[colIndex]));
map calls a provided callback function once for each element in an array, in order, and constructs a new array from the results. callback is invoked only for indexe...