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• Working with Objects
• Arrays
• Eloquent JavaScript - Data Structures

• Working with Objects
• Arrays
• Eloquent JavaScript - Data Structures

JSON is a textual representation of data, just like XML, YAML, CSV, and others. To work with such data, it first has to be converted to JavaScript data types, i.e. arrays and objects (and how to work with those was just explained). How to parse JSON is explained in the question Parse JSON in JavaScript? .

One could also use for...in to iterate over arrays, but there are reasons why this should be avoided: Why is 'for(var item in list)' with arrays considered bad practice in JavaScript?.

JSON is a textual representation of data, just like XML, YAML, CSV, and others. To work with such data, it first has to be converted to JavaScript data types, i.e. arrays and objects (and how to work with those was just explained). How to parse JSON is explained in the question Parse JSON in JavaScript? .

One could also use for...in to iterate over arrays, but there are reasons why this should be avoided: Why is 'for(var item in list)' with arrays considered bad practice in JavaScript?.

In addition to unknown keys, the "depth" of the data structure (i.e. how many nested objects per array) it has, might be unknown as well. How to access deeply nested properties depends on the exact data structure, then?

If the data structure contains repeating structures, e.g. the representation of a binary tree, the solution typically includes to recursively ^[Wikipedia] access each level of the data structure.

In addition to unknown keys, the "depth" of the data structure (i.e. how many nested objects) it has, might be unknown as well. How to access deeply nested properties usually depends on the exact data structure.

But if the data structure contains repeating patterns, e.g. the representation of a binary tree, the solution typically includes to recursively ^[Wikipedia] access each level of the data structure.