I im building and array where my array key is from a variable like this:
var art = $('#article_id').val(); var stk = $('#stk').val(); elements ={ art : stk }; alert(elements[art]);
but i end up with this output art=>50
instead of 5123=>50
Use Variable as Key for Objects in JavaScript log(obj. key); console. log(obj["key"]); The variable varr was set as the key for the object obj .
Array Elements Can Be ObjectsJavaScript variables can be objects. Arrays are special kinds of objects. Because of this, you can have variables of different types in the same Array.
JavaScript Array keys()The keys() method returns an Array Iterator object with the keys of an array. The keys() method does not change the original array.
const arr = [ {"name": "Rahul", "score": 89}, {"name": "Vivek", "score": 88}, {"name": "Rakesh", "score": 75}, {"name": "Sourav", "score": 82}, {"name": "Gautam", "score": 91}, {"name": "Sunil", "score": 79}, ];
ES 2015 provides support for this through a feature called computed property names (although the relevant section of the spec is called "Object Initializer").
Simply put, surround the variable (in general, any expression) with square brackets to evaluate it and use the result as a property name. In your example that would be
elements = { [art]: stk };
You cannot create object literals like that. You need to write
elements = {}; elements[art] = stk;
The reason why elements = { art: stk }
does not work is because it is equivalent to elements = { "art": stk }
(with quotes). The two versions are equivalent in JavaScript as long as art
is a legal identifier, and the second version makes it clear what's going on.
Use below to add dynamic key to an object.
elements = {}; elements[art] = stk;
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