We could classify objects of javascript or JSON ones to different groups based on their attributes' values. I modified original example as below coffeescript code from Reference link.
Suppose you have an array-variable of JSON objects and a variable of Object, and you want to classify or group them based on values of their date attributes.
warehouseOfClassifiedJSONObj = new Object();
arrayOfJSONObj = [
{name:"taro", date:"1996-01-01", total_average_price: 50},
{name: "flower", date: "1996-01-02", total_average_price: 70},
{name:"taro", date:"1996-01-02", total_average_price: 52},
{name:"sunkist", date:"1996-01-01", total_average_price: 50},
{name:"broccoli", date:"1996-01-03", total_average_price: 30}
];
for (element in arrayOfJSONObj) {
warehouseOfClassifiedJSONObj[element['date']] = warehouseOfClassifiedJSONObj[element['date']] || []; # important step for checking whether attributes in object is exist. If it doesn't exist, store an empty array into value of this attribute.
warehouseOfClassifiedJSONObj[element['date']].push(element); # store classified object into array
}
keysOfWarehouse = Object.keys(warehouseOfClassifiedJSONObj); # prepare keys for printing classified object in array
for (element in keysOfWarehouse ){
arrayOfAttributesValue = warehouseOfClassifiedJSONObj[element]
console.log("group " + element + ":");
for item in arrayOfAttributesValue {
console.log(item); # print item's content at browsers' console
}
}
console.log will print them as below in order:
group 1996-01-01:
{name: "taro", date: "1996-01-01", total_average_price: 50}
{name: "sunkist", date: "1996-01-01", total_average_price: 50}
group 1996-01-02:
{name: "flower", date: "1996-01-02", total_average_price: 70}
{name: "taro", date: "1996-01-02", total_average_price: 52}
group 1996-01-03:
{name: "broccoli", date: "1996-01-03", total_average_price: 30}
The following and similar method modified from aboved important step block and create is motivated from Reference link:
if (warehouseOfClassifiedJSONObj[element['date']]?.length) {
warehouseOfClassifiedJSONObj[element['date']].push(element);
}
else {
warehouseOfClassifiedJSONObj[element['date']] = [element];
}
Reference: