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Transposing a 2D-array in JavaScript
...on transpose(matrix) {
return matrix.reduce((prev, next) => next.map((item, i) =>
(prev[i] || []).concat(next[i])
), []);
}
Lodash/Underscore by marcel
function tranpose(matrix) {
return _.zip(...matrix);
}
// Without spread operator.
function transpose(matrix) {
return _.zip.a...
mongodb: insert if not exists
...input records again, creating batches of 15K or so. Extract out the keys (best if there's one key, but can't be helped if there isn't). Retrieve this bunch of records from Mongo with a db.collectionNameBlah.find({ field : { $in : [ 1, 2,3 ...}) query. For each of these records, determine if there...
Positioning MKMapView to show multiple annotations at once
...re sometimes stuck to the top of the map and not visible. Any input on the best approach to increase the zoom after the MKCoordinateRegion is created?
– Kyle C
Jan 16 '14 at 20:00
...
Which Java Collection should I use?
...
Best in brief summery that one can get anywhere :)
– roottraveller
Oct 13 '16 at 11:40
add a comment...
AsyncProcedures异步过程扩展 · App Inventor 2 中文网
...l ProcessedData from list
// 遍历处理每个数据项
for each item in dataList
// 模拟耗时处理
call wait 100
// 处理数据项
add item * 2 to ProcessedData
// 返回处理结果
return ProcessedData
// 处理完成后的回调
when Asyn...
Add an element to an array in Swift
...on if you wish to insert at the beginning of the array without loosing the item at the first position
extension Array{
mutating func appendAtBeginning(newItem : Element){
let copy = self
self = []
self.append(newItem)
self.appendContentsOf(copy)
}
}
...
JavaScript math, round to two decimal places [duplicate]
...
The best and simple solution I found is
function round(value, decimals) {
return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
}
round(1.005, 2); // 1.01
...
Eclipse: How do i refresh an entire workspace? F5 doesn't do it
...ts, ignoring closed projects, then the easiest way is to:
ctrl-click and item in the Project Explorer (to ensure the P. Explorer has focus)
ctrl-click the item again so that it's no longer highlighted (but the P. Explorer still has focus)
F5 will now Refresh the entire workspace
Effectively F5 r...
Android: View.setID(int id) programmatically - how to avoid ID conflicts?
...give them unique values during compile time.
res/values/ids.xml
<item name="my_edit_text_1" type="id"/>
<item name="my_button_1" type="id"/>
<item name="my_time_picker_1" type="id"/>
To use it in the code:
myEditTextView.setId(R.id.my_edit_text_1);
...
html - table row like a link
...le class='tr_link' > and give it to .tr_link{cursor:pointer} in css for best usage.
– Bagova
Mar 14 '16 at 14:58
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