simple question here. How can I find a key in the state where the value is true? For instance. Lets say I have this set as state: How can I return the key where the value is true? in this case 4? I would also like to return the length of the key / value pairs (7) and even be
Tag: object
Dynamically populating HTML with JavaScript objects
I have a js file containing data in the form of objects : I want to recreate the below structure dynamically: I want to do this with only JavaScript. I tried appending and creating new elements but I have to do it for each object. I think I am to create a function that loops through all the objects and
Javascript sort array of objects alphabetically AND put first objects with value
I’m trying to sort this data which contains various arrays of objects, the console.log of myData is something like: I’m trying to sort it alphabetically (based on value of name) and if the object has the parameter url , put it at the beginning. So the output would be: what I tried is this, and man…
Efficient way to find value from an object with over 10,000 key/value pairs
I have a big object with over 10,000 key-value pairs. I want to find the value of a specific pair so I do this: Is this efficient? Is there a better way to do this? is it OK to have an object with < 10,000 entries? Answer Javascript objects are implemented as hashmaps, so the complexity of retrieving a val…
Comparing two arrays of objects for matching properties then creating two new arrays
I have the following two arrays: I need to end up with a newArray containing only one object per Id, but if the ids in an object in the oldOrder array and newOrder array then I need to get the difference in the Qty positive or negative. So for example the above would create this new array: I would also
Merge multiple objects in array by id – javascript
This is my first question, so please be gentle 🙂 I know my question is similar to many others, and I have tried a LOT of solutions, but I’m not getting the result I need. I have an array of objects that can have duplicate id’s. There are 3 objects for id ‘THOM01’: The objects with the …
JS Object Mapping Quesions
I’ve been trying to understanding this part of the code: at line 9. What does the “map[stack[stack.length-1]]” mean? At first I thought the map is an object, but I think you are supposed to add ” ” mark around the properties. Is map a data structure? if it is, How can I use this …
concatenative inheritance two methods with same signature
The code below prints only the event contents, how do I make that print WheatherData.value number? I am coming from java and I am used to do it this way. Answer The line above causing the problem. When you assign _event object to { getValue, toString } object you are simply overriding toString method of Weath…
convert object into array of objects with additional properties in it
I have below code of data. It is an object and each key has a date to it. There are properties Open and Closed within it. If Closed is 0, then that property is not present. I want to achieve the following Can someone please let me know how to achieve this. I have tried this way but i dont
Loop through array of objects and display them in react component
I have an array of object as follows. The data is based on created_date for e.g. (“2021-09-12”) As you can see, i have got last 5 days of data. i.e. 12th Sep, 11th Sep, 10th Sep, 9th Sep and 8th Sep. The response does not have any data for 11th sept and 8th Sept. Based on this above information, i