Using associative arrays in javascript

Question

I want to create something like a dictionary object where given a name as key, it should output its value.

Eg

dict["jerry"] should output 20 as value.

Or

var name = "jerry";
dict[name]  should output 20 as value

My code.

var totalAdditions = [];
totalAdditions.push({name:statsObj.author.login, value: additions});
//statsObj.author.login contains "jerry"

console.log(obj.login); //also contains value "jerry"
console.log(totalAdditions[obj.login]); //returns undefined??

Answer 1

JavaScript doesn't have "associative arrays." It does have objects, which can do what you want, and Map (as of ES2015), which can also do what you want.

Object:

 var dict = Object.create(null); // Not {} so it doesn't inherit props like // "toString", "valueOf", etc. var name = "jerry"; dict["jerry"] = 20; console.log(dict[name]); // 20 

ES2015+ Map :

 let dict = new Map(); var name = "jerry"; dict.set("jerry", 20); console.log(dict.get(name)); // 20