From fcba4d927ced8410fdbcd8f9863741bf20e47ba8 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Sat, 15 Oct 2016 22:50:46 +0100
Subject: Merge the documentation about mappings
---
docs/frequently-asked-questions.rst | 46 -------------------------------------
1 file changed, 46 deletions(-)
(limited to 'docs/frequently-asked-questions.rst')
diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst
index 6d47e4a7..353d8abc 100644
--- a/docs/frequently-asked-questions.rst
+++ b/docs/frequently-asked-questions.rst
@@ -104,52 +104,6 @@ This example demonstrates how to send funds from a contract to an address.
See `endowment_retriever <https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/30_endowment_retriever.sol>`_.
-What is a ``mapping`` and how do we use them?
-=============================================
-
-A mapping is very similar to a K->V hashmap.
-If you have a state variable of type ``mapping (string -> uint) x;``, then you can
-access the value by ``x["somekeystring"]``.
-
-How can I get the length of a ``mapping``?
-==========================================
-
-Mappings are a rather low-level data structure. It does not store the keys
-and it is not possible to know which or how many values are "set". Actually,
-all values to all possible keys are set by default, they are just
-initialised with the zero value.
-
-In this sense, the attribute ``length`` for a mapping does not really apply.
-
-If you want to have a "sized mapping", you can use the iterable mapping
-(see below) or just a dynamically-sized array of structs.
-
-Are ``mapping``'s iterable?
-===========================
-
-Mappings themselves are not iterable, but you can use a higher-level
-datastructure on top of it, for example the `iterable mapping <https://github.com/ethereum/dapp-bin/blob/master/library/iterable_mapping.sol>`_.
-
-Can I put arrays inside of a ``mapping``? How do I make a ``mapping`` of a ``mapping``?
-=======================================================================================
-
-Mappings are already syntactically similar to arrays as they are, therefore it doesn't make much sense to store an array in them. Rather what you should do is create a mapping of a mapping.
-
-An example of this would be::
-
- contract C {
- struct myStruct {
- uint someNumber;
- string someString;
- }
-
- mapping(uint => mapping(string => myStruct)) myDynamicMapping;
-
- function storeInMapping() {
- myDynamicMapping[1]["Foo"] = myStruct(2, "Bar");
- }
- }
-
Can you return an array or a ``string`` from a solidity function call?
======================================================================
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