javascript - Find object by properties from array -

with array, value, , and object nested objects:

object

mesh 

array

['options', 'range', 'x'] 

value

12.5 

is possible translate update property, e.g.

mesh.options.range.x = 12.5 

attempted:

index = (obj, i) ->    obj[i]  arr.reduce(index, obj) = 12.5 

update

thank elegant solutions.

using .reduce() pretty nice this:

// current object----|    |----current key //                   v    v arr.reduce(function(obj, key) {     return obj == null ? obj : obj[key]; }, window.mesh); //        ^ //        |-- initial object 

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your attempt use .reduce() needed pass function manages "accumulation".

here, long previous obj wasn't null or undefined, it'll return key of current obj, becomes next obj.

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then since need assign value, you'd want value of second last key.

var o = arr.slice(0,-1).reduce(function(obj, key) {     return obj == null ? obj : obj[key]; }, window.mesh); 

and check existence , use last item in arr assignment.

o && o[arr.pop()] = 12.5; 

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all of can abstracted away function 1 or other based on how many arguments passed.

function setfromarray(obj, arr, val) {     var keys = arguments.length < 3 ? arr.slice() : arr.slice(0, -1);      var o = keys.slice(0,-1).reduce(function(obj, key) {         return obj == null ? obj : obj[key];     }, window.mesh);      if (arguments.length < 3)         return o;     else          o && o[keys.pop()]; }