Agreed, one should use a utility like lodash or underscore for this. Or write your own recursive function and use Object.keys.
To expand on what I believe Tal means regarding ordering --
An object's keys are ordered in the same order they were inserted (unless the keys look like numbers, in which case they're ascending)
Therefore:
JSON.stringify({a:1,b:2}) == JSON.stringify({b:2,a:1}) // false
I disagree. I wouldn't want to import a library to check such small thing. I can write a small function that recursively iterates and compares values of the properties.
Agree, but partially. An object is not a data structure in which an order is defined, right? Not sure if that would be a concern when comparing JSON objects.
" An object is not a data structure in which an order is defined, right?"
Yes and no. An object (any js object) has a list of keys that does have an explicit order. That order is first if the key can parse to a number, then the keys are ordered ascendingly, and then if the key cannot parse to a number, then the keys are sorted in the order they're inserted.
This is pretty specific to ecmascript/javascript, other languages have different rules for dynamic maps. In all languages however when creating equality rules for dynamic map-like structures, order isn't expected to matter for comparison. (Which is why stringify is the wrong choice for object comparison)
Agreed, one should use a utility like lodash or underscore for this. Or write your own recursive function and use Object.keys.
To expand on what I believe Tal means regarding ordering --
An object's keys are ordered in the same order they were inserted (unless the keys look like numbers, in which case they're ascending)
Therefore:
JSON.stringify({a:1,b:2}) == JSON.stringify({b:2,a:1}) // false
ya thanks you very much
I disagree. I wouldn't want to import a library to check such small thing. I can write a small function that recursively iterates and compares values of the properties.
Ya it depend if you use but the main concepts here its to use something more reliable then json strigify
And lodash is pretty small library
Agree, but partially. An object is not a data structure in which an order is defined, right? Not sure if that would be a concern when comparing JSON objects.
" An object is not a data structure in which an order is defined, right?"
Yes and no. An object (any js object) has a list of keys that does have an explicit order. That order is first if the key can parse to a number, then the keys are ordered ascendingly, and then if the key cannot parse to a number, then the keys are sorted in the order they're inserted.
This is pretty specific to ecmascript/javascript, other languages have different rules for dynamic maps. In all languages however when creating equality rules for dynamic map-like structures, order isn't expected to matter for comparison. (Which is why stringify is the wrong choice for object comparison)
Example:
Because those keys do have an order, if you used stringify as your comparison, {a: 1, b: 2} which you would expect to equal {b: 2, a: 1}, does not.