key

问题 Imagine a situation like this: I have a HashMap<Integer, String> , in which I store the connected clients. It is HashMap , because the order does not matter and I need speed. It looks like this: { 3: "John", 528: "Bob", 712: "Sue" } Most of the clients disconnected, so this is why I have the large gap. If I want to add a new client, I need a key and obviously the usage of _map.size() to get a key is incorrect. So, currently I use this function to get he lowest available key: private int

问题 A few months back I was tasked with implementing a unique and random code for our web application. The code would have to be user friendly and as small as possible, but still be essentially random (so users couldn't easily predict the next code in the sequence). It ended up generating values that looked something like this: Af3nT5Xf2 Unfortunately, I was never satisfied with the implementation. Guid's were out of the question, they were simply too big and difficult for users to type in. I was

问题 A few months back I was tasked with implementing a unique and random code for our web application. The code would have to be user friendly and as small as possible, but still be essentially random (so users couldn't easily predict the next code in the sequence). It ended up generating values that looked something like this: Af3nT5Xf2 Unfortunately, I was never satisfied with the implementation. Guid's were out of the question, they were simply too big and difficult for users to type in. I was

问题 How i can find keys with multiple match pattern, for example i've keys with foo:*, event:*, poi:* and article:* patterns. how i find keys with redis keys function for match with foo:* or poi:* pattern, its like find all keys with preffix foo:* or poi:* 回答1: You should not do this. KEYS is mainly a debug command. It is not supposed to be used for anything else. Redis is not a database supporting ad-hoc queries: you are supposed to provide access paths for the data you put into Redis (using

问题 In python... I have a list of elements 'my_list', and a dictionary 'my_dict' where some keys match in 'my_list'. I would like to search the dictionary and retrieve key/value pairs for the keys matching the 'my_list' elements. I tried this... if any(x in my_dict for x in my_list): print set(my_list)&set(my_dict) But it doesn't do the job. 回答1: (I renamed list to my_list and dict to my_dict to avoid the conflict with the type names.) For better performance, you should iterate over the list and

问题 I have the dict in python in the following format: dict1 = [{'Name':'a', 'value':20},{'Name':'b', 'value':10},{'Name':'c', 'value':15}] I want output something like this: dict2 = {'a':20, 'b':10, 'c':15 } How to do it ? 回答1: I think you can do it with for loop efficiently. Check this: dict1 = [{'Name':'a', 'value':20},{'Name':'b', 'value':10},{'Name':'c', 'value':15}] dict2 = dict() for a in range(len(dict1)): dict2[dict1[a].get('Name')] = dict1[a].get('value') print(dict2) Output: {'a': 20,

问题 I have the dict in python in the following format: dict1 = [{'Name':'a', 'value':20},{'Name':'b', 'value':10},{'Name':'c', 'value':15}] I want output something like this: dict2 = {'a':20, 'b':10, 'c':15 } How to do it ? 回答1: I think you can do it with for loop efficiently. Check this: dict1 = [{'Name':'a', 'value':20},{'Name':'b', 'value':10},{'Name':'c', 'value':15}] dict2 = dict() for a in range(len(dict1)): dict2[dict1[a].get('Name')] = dict1[a].get('value') print(dict2) Output: {'a': 20,

问题 I am using GWT components for web page. In my page I used ten text boxes. I want to block "tab" key event for navigate one text box to another text box. Expected Approach: If I pressed tab key it wont go to another text box. 回答1: You can do somthing like this. window.onkeydown = function() { if (event.keyCode == 9) { event.preventDefault(); } } 回答2: Use NativePreviewEventHandler and use the logic mentioned by Mayank Pandya, which is if (event.keyCode == 9) { event.preventDefault(); } Check

问题 I am using GWT components for web page. In my page I used ten text boxes. I want to block "tab" key event for navigate one text box to another text box. Expected Approach: If I pressed tab key it wont go to another text box. 回答1: You can do somthing like this. window.onkeydown = function() { if (event.keyCode == 9) { event.preventDefault(); } } 回答2: Use NativePreviewEventHandler and use the logic mentioned by Mayank Pandya, which is if (event.keyCode == 9) { event.preventDefault(); } Check

问题 This question already has answers here : React Warning: flattenChildren(…): Encountered two children with the same key (3 answers) Closed 2 years ago . Application works, my classes really adds a new element but I see below warning in console! Warning: Encountered two children with the same key, [object Object] . Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and