Strange Array Assignment In Javascript

Question

I've got the following:

alert("before: " + JSON.stringify(scenario_data)); // Outputs: {"1":{"amount":{"value":"","inputflag":false},"numberout":{"value":"","inputflag":false},"discount":{"value":"","inputflag":false}},"2":{"amount":{"value":"","inputflag":false},"numberout":{"value":"","inputflag":false},"discount":{"value":"","inputflag":false}}}

scenario_data[1]['amount']['value'] = 1234;

alert("After: " + JSON.stringify(scenario_data)); // Outputs: {"1":{"amount":{"value":1234,"inputflag":true},"numberout":{"value":"","inputflag":false},"discount":{"value":"","inputflag":false}},"2":{"amount":{"value":1234,"inputflag":true},"numberout":{"value":"","inputflag":false},"discount":{"value":"","inputflag":false}}}

Why are both scenario_data[1]['amount']['value'] and scenario_data[2]['amount']['value'] being set to 1234?

1 and 2 probably point to the same object.

jlowcs
– jlowcs

2015-03-17 21:58:05 +00:00
Commented Mar 17, 2015 at 21:58 — jlowcs
– jlowcs, Commented Mar 17, 2015 at 21:58

JuniorCompressor · Accepted Answer · 2015-03-17 21:55:42Z

4

Because scenario_data[0] and scenario_data[1] point to the same object. So, when you convert to json, both elements have the same representation. You could verify by checking the value of scenario_data[0] == scenario_data[1].

answered Mar 17, 2015 at 21:55

JuniorCompressor

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