如何使用lodash.keyBy更改集合中每个项目的标识符？

Question

I have a JSON string.

"1":{"name":"AK-47 | Aquamarine Revenge (Battle-Scarred)","price":"13.55","sold":"444"},"2":{"name":"AK-47 | Aquamarine Revenge (Factory New)","price":"38.96","sold":"157"} 

and so on...

How can I remove the numbers (1,2,3,etc...), and use the "name" value to identify each item intead? I've looked at lodash.keyBy, but I haven't been able to make "name" the identifier. The end goal is to be able to do call obj[itemName] - and receive the price.

Answer 1

Lodash has a different method _.mapKeys which suits this a little better:

 const obj = { "1": { "name":"AK-47 | Aquamarine Revenge (Battle-Scarred)", "price":"13.55", "sold":"444" }, "2":{ "name":"AK-47 | Aquamarine Revenge (Factory New)", "price":"38.96", "sold":"157" } } console.log(_.mapKeys(obj, (val) => val.name)); 

 <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script> 

Answer 2

Like this?

x = x={"1":{"name":"AK-47 | Aquamarine Revenge (Battle-Scarred)","price":"13.55","sold":"444"},"2":{"name":"AK-47 | Aquamarine Revenge (Factory New)","price":"38.96","sold":"157"} }
_.reduce(x, (acc,o) => {acc[o.name] = o; return acc;}, {})

If you want, you can also remove the "name" from the resultant key, and also create a copy of the original instead of reference.

_.reduce(x, (acc,o) => {acc[o.name] = Object.assign({},o); delete acc[o.name].name; return acc;}, {})

Answer 3

Why does it have to be done with _.keyBy ? How about with _.each and _.omit ? ( _.omit makes the assumption you don't need the name key/value pair anymore)

var before = {"1":{"name":"AK-47 | Aquamarine Revenge (Battle-Scarred)","price":"13.55","sold":"444"},"2":{"name":"AK-47 | Aquamarine Revenge (Factory New)","price":"38.96","sold":"157"}};
var after = {};

_.each(before, function(b4) {
  after[b4.name] = _.omit(b4, 'name');
});

See: https://repl.it/@dexygen/stackoverflowq48085676

Answer 4

This gives you the whole item by giving a specific name.

var jsonArray = [{name: "AK-47 | Aquamarine Revenge (Factory New)", price: "38.96", sold: "157"}, {name: "Glock-18 | Fade (Factory New)", price: "287,10", sold: "256"}];

function match(x) {
return x[this[0]]===this[1];
}

var nameToCheck = "AK-47 | Aquamarine Revenge (Factory New)"

var getObject = jsonArray.filter(match, ["name", nameToCheck]);

console.log(getObject);

If you want the price, you just do:

var price = getObject[0].price;