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I have following JSON structure:
{
"shops": {
"categories": {
"cat_1": {
"id": "1",
"label": "Men's Fashions",
"Brands": [{
"id": "2",
"name": "Smith"
}]
},
"cat_2": {
"id": "2",
"label": "Restaurants",
"Brands": [{
"id": "3",
"name": "KFC"
}, {
"id": "4",
"name": "SUBWAY"
}, {
"id": "5",
"name": "MLD"
}, {
"id": "6",
"name": "THAI"
}]
},
"cat_3": {
"id": "3",
"label": "Specialty Shops",
"Brands": [{
"id": "7",
"name": "BODY SHOP"
}]
}
}
}
}
I'd like to achieve something like this:
[{
"categoryid": "1",
"id": "2",
"label": "Men's Fashions",
"name": "Smith"
},
{
"categoryid": "2",
"id": "3",
"label": "Restaurants",
"name": "KFC"
},
{
"categoryid": "2",
"id": "4",
"label": "Restaurants",
"name": "SUBWAY"
},
{
"categoryid": "2",
"id": "5",
"label": "Restaurants",
"name": "MLD"
},
{
"categoryid": "2",
"id": "6",
"label": "Restaurants",
"name": "THAI"
}, {
"categoryid": "3",
"id": "7",
"label": "Specialty Shops",
"name": "BODY SHOP"
},
]
Is there an elegant way to achieve it using underscore?
I tried to use nested _.each() to do that, but feel there might be something better.
generateArray: function(obj) {
var newResult = [];
_.each(obj.categories, function(c) {
_.each(c.Brands, function(d) {
newResult.push({
"categoryid": c.id,
"id": d.id,
"label": c.label,
"name": d.name
});
});
});
return newResult;
}
Anyone can advise me which way is more efficiency at running time?
mine or @Artyom Neustroev or @Anthony Chu ?
I have following JSON structure:
{
"shops": {
"categories": {
"cat_1": {
"id": "1",
"label": "Men's Fashions",
"Brands": [{
"id": "2",
"name": "Smith"
}]
},
"cat_2": {
"id": "2",
"label": "Restaurants",
"Brands": [{
"id": "3",
"name": "KFC"
}, {
"id": "4",
"name": "SUBWAY"
}, {
"id": "5",
"name": "MLD"
}, {
"id": "6",
"name": "THAI"
}]
},
"cat_3": {
"id": "3",
"label": "Specialty Shops",
"Brands": [{
"id": "7",
"name": "BODY SHOP"
}]
}
}
}
}
I'd like to achieve something like this:
[{
"categoryid": "1",
"id": "2",
"label": "Men's Fashions",
"name": "Smith"
},
{
"categoryid": "2",
"id": "3",
"label": "Restaurants",
"name": "KFC"
},
{
"categoryid": "2",
"id": "4",
"label": "Restaurants",
"name": "SUBWAY"
},
{
"categoryid": "2",
"id": "5",
"label": "Restaurants",
"name": "MLD"
},
{
"categoryid": "2",
"id": "6",
"label": "Restaurants",
"name": "THAI"
}, {
"categoryid": "3",
"id": "7",
"label": "Specialty Shops",
"name": "BODY SHOP"
},
]
Is there an elegant way to achieve it using underscore?
I tried to use nested _.each() to do that, but feel there might be something better.
generateArray: function(obj) {
var newResult = [];
_.each(obj.categories, function(c) {
_.each(c.Brands, function(d) {
newResult.push({
"categoryid": c.id,
"id": d.id,
"label": c.label,
"name": d.name
});
});
});
return newResult;
}
Anyone can advise me which way is more efficiency at running time?
mine or @Artyom Neustroev or @Anthony Chu ?
Share Improve this question edited Apr 18, 2014 at 8:23 JavaScripter asked Apr 18, 2014 at 7:46 JavaScripterJavaScripter 4,85210 gold badges39 silver badges45 bronze badges 2-
1
Can you show us what you did with
_each? – A1rPun Commented Apr 18, 2014 at 7:49 - @Robert: Artyom's answer should be the fastest. Mine is just another way to do it with underscore. Out of the 3, yours is actually the most readable, IMHO. :) – Anthony Chu Commented Apr 18, 2014 at 21:38
2 Answers
Reset to default 4You don't really need underscore for that task. Use simple for .. in .. and for (...) loops:
var json = {...};
var result = [];
for (var catKey in json.shops.categories) {
var currentCategory = json.shops.categories[catKey];
for (var i = 0; i < currentCategory.Brands.length; i++) {
var currentBrand = currentCategory.Brands[i];
result.push({
categoryid: currentCategory.id,
label: currentCategory.label,
id: currentBrand.id,
name: currentBrand.name
});
}
}
Fiddle here
Instead of each()'s, here's a way to do it with map()'s...
var output = _.chain(input.shops.categories)
.map(function (category) {
return _(category.Brands).map(function (brand) {
return { categoryId: category.id,
id: brand.id,
label: category.label,
name: brand.name
};
});
}).flatten().value();
JSFIDDLE
I have following JSON structure:
{
"shops": {
"categories": {
"cat_1": {
"id": "1",
"label": "Men's Fashions",
"Brands": [{
"id": "2",
"name": "Smith"
}]
},
"cat_2": {
"id": "2",
"label": "Restaurants",
"Brands": [{
"id": "3",
"name": "KFC"
}, {
"id": "4",
"name": "SUBWAY"
}, {
"id": "5",
"name": "MLD"
}, {
"id": "6",
"name": "THAI"
}]
},
"cat_3": {
"id": "3",
"label": "Specialty Shops",
"Brands": [{
"id": "7",
"name": "BODY SHOP"
}]
}
}
}
}
I'd like to achieve something like this:
[{
"categoryid": "1",
"id": "2",
"label": "Men's Fashions",
"name": "Smith"
},
{
"categoryid": "2",
"id": "3",
"label": "Restaurants",
"name": "KFC"
},
{
"categoryid": "2",
"id": "4",
"label": "Restaurants",
"name": "SUBWAY"
},
{
"categoryid": "2",
"id": "5",
"label": "Restaurants",
"name": "MLD"
},
{
"categoryid": "2",
"id": "6",
"label": "Restaurants",
"name": "THAI"
}, {
"categoryid": "3",
"id": "7",
"label": "Specialty Shops",
"name": "BODY SHOP"
},
]
Is there an elegant way to achieve it using underscore?
I tried to use nested _.each() to do that, but feel there might be something better.
generateArray: function(obj) {
var newResult = [];
_.each(obj.categories, function(c) {
_.each(c.Brands, function(d) {
newResult.push({
"categoryid": c.id,
"id": d.id,
"label": c.label,
"name": d.name
});
});
});
return newResult;
}
Anyone can advise me which way is more efficiency at running time?
mine or @Artyom Neustroev or @Anthony Chu ?
I have following JSON structure:
{
"shops": {
"categories": {
"cat_1": {
"id": "1",
"label": "Men's Fashions",
"Brands": [{
"id": "2",
"name": "Smith"
}]
},
"cat_2": {
"id": "2",
"label": "Restaurants",
"Brands": [{
"id": "3",
"name": "KFC"
}, {
"id": "4",
"name": "SUBWAY"
}, {
"id": "5",
"name": "MLD"
}, {
"id": "6",
"name": "THAI"
}]
},
"cat_3": {
"id": "3",
"label": "Specialty Shops",
"Brands": [{
"id": "7",
"name": "BODY SHOP"
}]
}
}
}
}
I'd like to achieve something like this:
[{
"categoryid": "1",
"id": "2",
"label": "Men's Fashions",
"name": "Smith"
},
{
"categoryid": "2",
"id": "3",
"label": "Restaurants",
"name": "KFC"
},
{
"categoryid": "2",
"id": "4",
"label": "Restaurants",
"name": "SUBWAY"
},
{
"categoryid": "2",
"id": "5",
"label": "Restaurants",
"name": "MLD"
},
{
"categoryid": "2",
"id": "6",
"label": "Restaurants",
"name": "THAI"
}, {
"categoryid": "3",
"id": "7",
"label": "Specialty Shops",
"name": "BODY SHOP"
},
]
Is there an elegant way to achieve it using underscore?
I tried to use nested _.each() to do that, but feel there might be something better.
generateArray: function(obj) {
var newResult = [];
_.each(obj.categories, function(c) {
_.each(c.Brands, function(d) {
newResult.push({
"categoryid": c.id,
"id": d.id,
"label": c.label,
"name": d.name
});
});
});
return newResult;
}
Anyone can advise me which way is more efficiency at running time?
mine or @Artyom Neustroev or @Anthony Chu ?
Share Improve this question edited Apr 18, 2014 at 8:23 JavaScripter asked Apr 18, 2014 at 7:46 JavaScripterJavaScripter 4,85210 gold badges39 silver badges45 bronze badges 2-
1
Can you show us what you did with
_each? – A1rPun Commented Apr 18, 2014 at 7:49 - @Robert: Artyom's answer should be the fastest. Mine is just another way to do it with underscore. Out of the 3, yours is actually the most readable, IMHO. :) – Anthony Chu Commented Apr 18, 2014 at 21:38
2 Answers
Reset to default 4You don't really need underscore for that task. Use simple for .. in .. and for (...) loops:
var json = {...};
var result = [];
for (var catKey in json.shops.categories) {
var currentCategory = json.shops.categories[catKey];
for (var i = 0; i < currentCategory.Brands.length; i++) {
var currentBrand = currentCategory.Brands[i];
result.push({
categoryid: currentCategory.id,
label: currentCategory.label,
id: currentBrand.id,
name: currentBrand.name
});
}
}
Fiddle here
Instead of each()'s, here's a way to do it with map()'s...
var output = _.chain(input.shops.categories)
.map(function (category) {
return _(category.Brands).map(function (brand) {
return { categoryId: category.id,
id: brand.id,
label: category.label,
name: brand.name
};
});
}).flatten().value();
JSFIDDLE
本文标签： javascriptUnderscore Create array of objects from JSON objectStack Overflow
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