josdejong/mathjs

toObject and fromObject

Open

#1.679 aberto em 22 de nov. de 2019

Ver no GitHub
 (7 comments) (1 reaction) (0 assignees)JavaScript (1.298 forks)batch import
featurehelp wanted

Métricas do repositório

Stars
 (13.832 stars)
Métricas de merge de PR
 (Nenhuma PRs mesclada em 30d)

Description

I can serialize and de-serialize an expression to JSON as shown here: https://mathjs.org/docs/core/serialization.html

In my application the expression is part of a bigger JSON which is de-serialized at a higher level. I would need to de-serialize an expression from an object like this:

const node = math.parse('age >= 21 ? 999 + 5 : 111 + 2')
const objectExpression = node.toObject();
const node2 = math.fromObject(objectExpression)

Of course I could do something like this but it's not optimal because I would have to serialize the object to JSON first:

const node = math.parse('age >= 21 ? 999 + 5 : 111 + 2')
const json = JSON.stringify(node);
const expression = JSON.parse(json, math.revive);

Is there a way to do this without calling the revive function recursively? I tried to use map-keys-deep but the reviver gets called for a parent leaf and then for the child and it seems that the order need to be reversed to use the revive function.

Guia do colaborador