I have the following object and lodash "queries" in Node.js (I'm simply running node in the terminal):
var obj = { a: [{ b: [{ c: "apple" }, { d: "not apple" }, { c: "pineapple" }] }] }; > _.get(obj, "a[0].b[0].c") 'apple' > _.get(obj, "a[0].b[1].c") undefined > _.get(obj, "a[0].b[2].c") 'pineapple' My question is: is there a way to return an array of values where the path was found to be valid?
Example:
> _.get(obj, "a[].b[].c") ['apple', 'pineapple'] As @Tomalak has suggested in a comment, the solution was to use JSONPath instead of Lodash.
Their github page: https://github.com/dchester/jsonpath
Example:
> var jp = require("jsonpath") > var obj = { a: [{ b: [{ c: "apple" }, { d: "not apple" }, { c: "pineapple" }] }] }; > jp.query(obj, "$.a[*].b[*].c") [ 'apple', 'pineapple' ] i dont know if this will be the most efficient or what you need but can you use _.each or _.map to create an array if some conditions are valid? maybe something like
let first = _.map(object, (item) => { //change logic for maybe if(item.b.c) { return item.b.c } }) //filter out nulls let second = _.without(first, null) Following function may help without using any additional libraries.
function getall(input, path = "", accumulator = []) { path = path.split("."); const head = path.shift(); if (input && input[head] !== undefined) { if (!path.length) { accumulator.push(input[head]); } else if (Array.isArray(input[head])) { input[head].forEach(el => { getall(el, path.join('.'), accumulator); }); } else { getall(input[head], path.join('.'), accumulator); } } return accumulator; } Samples
> getall(obj, 'a.b') [ [ { c: 'apple' }, { d: 'not apple' }, { c: 'pineapple' } ] ] > getall(obj, 'a.b.c') [ 'apple', 'pineapple' ] > getall(obj, 'a.b.d') [ 'not apple' ] > getall(obj, 'a.b.e') [] How about using flatMap and map
_(obj.a).flatMap('b').map('c').compact();
a[0].b? Or any path, as you provided in the question?jsonpath.query(obj, '$.a[*].b[*].c');