ios - How to make a dictionary of dictionaries in JSON? -

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right have structure in json

"types":[               {                  "lowcadence":[                     {                        "reinforcement":"-1",                      "weight":"100",                      "message":"pay attention. you're running low cadence. cadence %d steps per minute."                   }                ]             },             {                  "normalcadence":[                     {                        "reinforcement":"0",                      "weight":"100",                      "message":"great, cadence on target. cadence %d steps per minute.",                      "enforcementsound":"ding"                   }                ]             },             {                  "highcadence":[                     {                        "reinforcement":"1",                      "weight":"100",                      "message":"slow down. you're running on planned cadence. cadence %d steps per minute."                   }                ]             }          ]

but have structure

enter image description here

does know how write in json?

i believe json like:

var types = {     normalhr: {         reinforcement: 0,         weight: 100,         message: 'great! heart rate in zone.',         enforcementsound: 'ding'     },     highhr: {         reinforcement: 1,         weight: 100,         message: 'slow down. heart rate high!'     },     lowhr: {         reinforcement: -1,         weight: 100,         message: 'speed up. low heart rate.'     } };

as @balder says in answer, can access use dictionary-style syntax, like:

  • types['normalhr']['reinforcement']

you use property-accessor syntax, like:

  • types.normalhr.reinforcement

the reason didn't include "type" of each item, can infer building grid - follows:

  • typeof types.normalhr.reinforcement (this return "number")
  • typeof types.normalhr.message (this return "string")

similarly, counts - can count properties of specific object. in modern browsers, try:

  • object.keys(types.normalhr).length (this return 2)

for older browsers, refer other methods here: how efficiently count number of keys/properties of object in javascript?

hope helps!


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