arrays

问题 I want to create a function that takes as parameters: An array filled of coordinates The current user location And return the closest location between the user's location and the array locations. Here are my locations: let coord1 = CLLocation(latitude: 52.45678, longitude: 13.98765) let coord2 = CLLocation(latitude: 52.12345, longitude: 13.54321) let coord3 = CLLocation(latitude: 48.771896, longitude: 2.270748000000026) User location function: func locationManager(_ manager: CLLocationManager

问题 This question already has an answer here : Why does a large local array crash my program, but a global one doesn't? [duplicate] (1 answer) Closed 2 years ago . When I write the following program, it works correctly i.e. the bitset array is declared outside the main() method. Correctly Works #include <iostream> #include <bitset> using namespace std; bitset<5000> set[5000]; int main(){ cout<<"program runs fine"<<endl; return 0; } But I get stack-overflow exception when I create it inside the

问题 This question already has an answer here : Why does a large local array crash my program, but a global one doesn't? [duplicate] (1 answer) Closed 2 years ago . When I write the following program, it works correctly i.e. the bitset array is declared outside the main() method. Correctly Works #include <iostream> #include <bitset> using namespace std; bitset<5000> set[5000]; int main(){ cout<<"program runs fine"<<endl; return 0; } But I get stack-overflow exception when I create it inside the

问题 This question already has an answer here : Why does a large local array crash my program, but a global one doesn't? [duplicate] (1 answer) Closed 2 years ago . When I write the following program, it works correctly i.e. the bitset array is declared outside the main() method. Correctly Works #include <iostream> #include <bitset> using namespace std; bitset<5000> set[5000]; int main(){ cout<<"program runs fine"<<endl; return 0; } But I get stack-overflow exception when I create it inside the

问题 This question already has an answer here : Why does a large local array crash my program, but a global one doesn't? [duplicate] (1 answer) Closed 2 years ago . When I write the following program, it works correctly i.e. the bitset array is declared outside the main() method. Correctly Works #include <iostream> #include <bitset> using namespace std; bitset<5000> set[5000]; int main(){ cout<<"program runs fine"<<endl; return 0; } But I get stack-overflow exception when I create it inside the

问题 When running this query: SELECT id,selected_placements FROM app_data.content_cards I get a table like this: +----+-------------------------------+ | id | selected_placements | +----+-------------------------------+ | 90 | {162,108,156,80,163,155,NULL} | +----+-------------------------------+ | 91 | {} | +----+-------------------------------+ What I want to do now is get this same information but with the arrays splitted into rows so I get a result like this: +----+---------------------+ | id

问题 When running this query: SELECT id,selected_placements FROM app_data.content_cards I get a table like this: +----+-------------------------------+ | id | selected_placements | +----+-------------------------------+ | 90 | {162,108,156,80,163,155,NULL} | +----+-------------------------------+ | 91 | {} | +----+-------------------------------+ What I want to do now is get this same information but with the arrays splitted into rows so I get a result like this: +----+---------------------+ | id

问题 I'm going through the MDN docs on arrays and when we want to test whether or not an object is an array we use isArray() . However, it's usage is very different to most of the other methods. When you use the regular syntax an error pops up: console.log([1,2,3].isArray()); // TypeError: [1, 2, 3].isArray is not a function Whereas this does work: console.log(Array.isArray([1,2,3])) I don't understand why isArray() (and a couple of other methods) rely upon some global object rather than just

问题 I'm going through the MDN docs on arrays and when we want to test whether or not an object is an array we use isArray() . However, it's usage is very different to most of the other methods. When you use the regular syntax an error pops up: console.log([1,2,3].isArray()); // TypeError: [1, 2, 3].isArray is not a function Whereas this does work: console.log(Array.isArray([1,2,3])) I don't understand why isArray() (and a couple of other methods) rely upon some global object rather than just

问题 What's the best method to get the index of an object in an object array given multiple of it's properties? Imagine the following example array: var array = [ { color: 'red', shape: 'square', weight: 200 }, { color: 'blue', shape: 'circle', weight: 300 }, { color: 'red', shape: 'circle', weight: 100 } ]; Now I would like to have the indexOf the object which color property is red and shape is circle which, in this example, would be 2 . Ideally the function would return the index of the object