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Transposing a 2D-array in JavaScript
...el
function tranpose(matrix) {
return _.zip(...matrix);
}
// Without spread operator.
function transpose(matrix) {
return _.zip.apply(_, [[1,2,3], [1,2,3], [1,2,3]])
}
Vanilla approach
function transpose(matrix) {
const rows = matrix.length, cols = matrix[0].length;
const grid = [];
f...
Postgres and Indexes on Foreign Keys and Primary Keys
... @Matthias - Ah, got it. Thanks. Yeah, I obviously didn't take time to read through the code. It wasn't critical enough to bother. The OP could've mentioned the limitations. Maybe I'll check it out again sometime.
– juanitogan
Mar 31 '17 at 1:23
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Generic type parameter naming convention for Java (with multiple chars)?
...generic type parameters with more than one character to make the code more readable.
5 Answers
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Create a custom View by inflating a layout?
...r your components in code (TextView, etc), and in your constructor you can read the attributes passed in from the XML. You can then pass that attribute to your title TextView.
http://developer.android.com/guide/topics/ui/custom-components.html
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Detect changes in the DOM
...you, as a programmer, can take this code and use it however you wish. just read on the MDN which things you can observe the DOM for and which you cannot.
– vsync
Mar 6 '14 at 15:43
...
Entity Framework and Connection Pooling
...off connnection pooling in connection string if you don't want to use it. (read more about SQL Server Connection Pooling (ADO.NET))
Never ever use global context. ObjectContext internally implements several patterns including Identity Map and Unit of Work. Impact of using global context is different...
Do you have to put Task.Run in a method to make it async?
...synchronous" (async) means that it may yield control back to the calling thread before it starts. In an async method, those "yield" points are await expressions.
This is very different than the term "asynchronous", as (mis)used by the MSDN documentation for years to mean "executes on a background t...
Why does direction of index matter in MongoDB?
...ormally the performance hit is negligible (especially compared to gains in read performance), but that doesn't mean that we can't be smart about creating our indexes.
How Indexes
Identifying what group of fields should be indexed together is about understanding the queries that you are running. The ...
How to find the last field using 'cut'
...rocess data in bulk. I mean, this is great if you have one line of text already in a shell variable, or if you want to do while IFS= read -ra array_var; do :;done <(cmd) to process a few lines. But for a big file, rev|cut|rev is probably faster! (And of course awk will be faster than that.)
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How to model type-safe enum types?
... you say "not accepting non-symbols where a symbol is expected", it can be read either as "not accepting values that are not instances of Symbol" (which is obviously true) or "not accepting values that are not plain identifier-like strings, aka 'symbols'" (which is not true, and is a misconception t...