Suppose I have an object with this structure: In the object, the first number (the key) is a timestamp. The second number is the value. I want to get the most recent item of that object. So, I need to get the key that is closest in time. How do I have to do it? Answer So, I need to
Tag: arrays
Is a JavaScript array index a string or an integer?
I had a generic question about JavaScript arrays. Are array indices in JavaScript internally handled as strings? I read somewhere that because arrays are objects in JavaScript, the index is actually a string. I am a bit confused about this, and would be glad for any explanation. Answer That is correct so:
How do I optimally distribute values over an array of percentages?
Let’s say I have the following code: To find out how to equally distribute a hundred over the array is simple, it’s a case of: Or doing it using a for loop: However, let’s say each counter is an object and thus has to be whole. How can I equally (as much as I can) distribute them on a differ…
How to initialize a boolean array in javascript
I am learning javascript and I want to initialize a boolean array in javascript. I tried doing this: But it doesn’t work. After googling I only found this way: But I find this a very difficult way just to initialize an array. Any one knows another way to do that? Answer You were getting an error with th…
A Vector Class in Javascript
I’m trying to implement a vector object instantiated like below… …and when I do a math operation I need something like this… …but my code below returns me just an array Please help me out here. Thank you! Answer You need to wrap up your resulting array in a new Vector object: I s…
indexOf() when array-elements are objects (javascript)
For instance, a variable named arrayElements of type array contains: [{id:1, value:5},{id:2, value:6},{id:3, value:7},{id:4, value:8}]. How do I get the position of the array element with id === 3(3rd element) in the arrayElements variable besides using loop? thanks. Answer You have to loop at one point. But …
Javascript remove all occurrence of duplicate element, leaving the only one that is unique
I want to remove elements that occurr more than once and get the unique element. The array always has 3 elements. Lets say i have an array [2,3,2], then I need to get 3 which is only unique in the array(removing both 2s, because they occur more than once). I have tried with following code, but surely it doesn…
Return index value from filter method javascript
I have an array of objects in my angular controller. I want to return the value of the index of the field within the array which has a matching ID to my parameter. There will only be one object in the array with a matching fieldId.. Answer You can’t return index from filter method. The filter() method c…
Update if exists or add new element to array of objects – elegant way in javascript + lodash
So I have an array of objects like that: uid is unique id of the object in this array. I’m searching for the elegant way to modify the object if we have the object with the given uid, or add a new element, if the presented uid doesn’t exist in the array. I imagine the function to be behave like
JSON – how to parse it?
I just got a problem about this response. Supposedly if I want to choose item from the response it must be an array value. Actually must be like this one right? (let me know if I’m mistaken) My code: Then I want to put telegraphicTransferBankMapItem.xxxxxx as bankId and telegraphicTransferBankMapItem.yy…