How can I unpack nested object passed as a parameter? I want to unpack age from the object how can I do that? Answer You can destructure any level as: or, if you don’t want to assign to a new variable name then:
Tag: javascript-objects
Typescript: How do I define an interface for an object type’s key value pair
I have an object called externalObject that has various key:value pairs. I also have a typescript interface that is defined as the following: My question is how do I further set the type for the externalObject’s key as string and the values that are passed inside externalObject as string or number? Note: we do not always know the key:value pairs.
React JS useState get key where value is true
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
Function returns Nan returns when I send More argument then function parameters
I couldn’t understand why it send the nan when I pass more arguments than parameters Answer You pass into percetageofworld3 two parameter but the function have just one, so you pass country for example ‘italy’ and it will be return (‘italy’ / 7900) * 100; If you pass only number work
How to push object keys to an array multiple times based on their integer values in JavaScript
I’ve looked on several sites including through the suggested answers when posting this question, so forgive me if it’s been answered elsewhere. I’m very new to JavaScript (and coding in general). I’m working on a ‘weighted lottery’ project and I have an approach in mind that I’m sure will work, but am stuck on a particular point. I have an
Javascript functions, multiple prototype inheritance
I have an assignment to implement a diagram using javascript prototypes and constructors. For now I have to implement multiple inheritance using prototypes. I know how to implement single inheritance and I am stuck on inheriting multiple prototypes. This question is focusing on WeatherData inheriting Event and DataType objects. I havent tested the code but I am sure it’s wrong
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 WeatherData function. Instead, just return
Javascript ‘for of’ loop not properly resolving to the value
I have a simple array that I’m trying to iterate over but I’m apparently not understanding the ‘for of’ JavaScript loop. The following code returns exactly has it should; return: KD0NBHOBJ W0DLKOBJ WA0TJTOBJ But the following code errors out with; “TypeError: i.getCenter is not a function. (In ‘i.getCenter()’, ‘i.getCenter’ is undefined)” because the variable ‘i’ does not resolve to one
How can i access and change a value in an object with an array of keys
How can I access and change the object with the array of keys? I have tried loadash.get but it can only get values not change them. Answer You need to do something like the following: And then you could use it in the following way: With a function like the above set you can update an object passing an array
how to set a value of a key of an array object in javascript?
I’m creating a drag and drop files(multiple files can be selected) feature. WHere user can select multiple files.I want to convert the size of file from byte to mb. . the function to get all the files scripts.js I’m getting this as an output of files variable value in console. Why i’m using spread operator? Ans: If i don’t use