How to get a key in a JavaScript object by its value
If you have an object with array values Here is a good example Let us suppose you want to show an icon based on the extension of the file you have All the extensions with the same icon go under the same object value Note wrap the cases here in an object is better than do a switch with a lot of cases
Find a value in an array of objects in Javascript duplicate , Search should return the object that match the search should return undefined becuase non of the objects in the array have that value should return undefined becuase our array of objects dont have ids 3 passing 12ms Old answer removed due to bad practices
Is there a simple way to create a javascript lookup table
I think we need to know a lot more about the data Do you have lookup values for all values of A B C that are less than X If so then you can use a three dimensional array var answer data 1 2 3 or answer data 2 2 3 You would of course have to fill this three dimensional array with the proper data
Object values JavaScript MDN MDN Web Docs, Object values returns an array whose elements are values of enumerable string keyed properties found directly upon object This is the same as iterating with a for in loop except that a for in loop enumerates properties in the prototype chain as well The order of the array returned by Object values is the same as that provided by a
Property accessors JavaScript MDN MDN Web Docs
Property accessors JavaScript MDN MDN Web Docs, Dot notation In the object propertyName syntax the propertyName must be a valid JavaScript identifier which can also be a reserved word For example object 1 is valid while object 1 is not js const variable object propertyName object propertyName value
JavaScript Lookup Table Delft Stack
Performance javascript object property lookup Stack Overflow
Performance javascript object property lookup Stack Overflow In the worst case properties in JavaScript Objects are implemented as elements in a hash table Property lookup is in this case performed in constant time on average It s good to note though that in very rare worst case scenarios hash table search time can be linear
JavaScript Object Keys Tutorial How To Use A JS Key Value Pair
If the property doesn t exist in the object the hasOwnProperty method returns false as shown below const exists food hasOwnProperty snacks console log exists false Note that the hasOwnProperty method only checks the presence of the specified property in the object s own properties How to check if a property exists in an object in JavaScript. The implementation of String prototype match itself is very simple it simply calls the Symbol match method of the argument with the string as the first parameter The actual implementation comes from RegExp prototype match If you need to know if a string matches a regular expression RegExp use RegExp prototype test If you only want the first match found you might want to use Objects can be thought of as a key value storage like a dictionary If you have tabular data you can use an object to lookup values rather than a switch statement or an if else chain This is most useful when you know that your input data is limited to a certain range Here is an example of an article object
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