On Oct 4, 2012, at 5:32 PM, Rick Waldron wrote:
>
>
> On Thu, Oct 4, 2012 at 8:16 PM, Brendan Eich <[email protected]> wrote:
> Nicholas C. Zakas wrote:
> I agree, I'm not sure there is a rational default for Map, but I think there
> is one for Set as an array (and it seems like most people agreed).
>
> As with Set, I claim the default JSON for Map should be
>
> [[key1, value1], ~~~ [keyN, valueN]]
>
>
> I'm still curious about my question from yesterday; instead of repasting, I
> put it in a gist:
>
> https://gist.github.com/3837337
>
Something like:
{"<kind>" : "Map",
"<mapData>" : [
[ key1, value1],
[ keyN, valueN]
]
}
is arguably a better because then you can write a reviver function that
recognizes it:
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
function mapReviver(key, value) {
if (typeof value != "object") return value;
switch (value["<kind>"]){
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(e=>newValue.set(e[0], e[1]));
return newValue;
}
default: return value;
}
}
var tree = JSON.parse(sourceString, mapReviver);
This should work for Map's nested at any level of a JSON tree, including Maps
nested within Maps.
Allen
if (typeof value != "object") return value;
switch (value["<kind>"]) {
case undefined: return value;
case "Map": {
let newValue = new Map;
let mapData = value["<mapData>"];
if (!mapData) return value;
mapData.forEach(function(e){newValue.set(e[0], e[1])});
return newValue;
}
default: return value;
}
}
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