A list of tuples in Javascript [closed]

Question

Let's say I receive a JSON-string containing information about people. Now I loop through all the JSON-objects and extract the name and age or each person.

How would I store these as tuples in a list for further processing? (E.g. by another function)

Answer 1

Assuming the incoming JSON is something like the following:

var incomingList = [{   "name": "Homer Simpson",   "age": 45,   "occupation": "Nuclear Plant Technician",     ... },{   "name": "Marge Simpson",   "age": 44,   "occupation": "Homemaker",     ... },   ... ] 

You could extract the name and age only into a similar array of objects:

var nameAndAgeList = incomingList.map(function(item) {   return {     name: item.name,     age: item.age   }; }); 

JavaScript only has objects and arrays, not tuples. If your data is associative (each record has key-value-pairs with the field name as the key) then the above approach will work fine.

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However, if you need to associate the names and ages in a single object as key-value-pairs (like an associative array) with names as keys and ages as values, the following will work (assuming the names are unique):

var namesAndAges = incomingList.reduce(function(result,item) {   result[item.name] = item.age;   return result; },{}); 

Answer 2

Building on Vikram's answer, as you have specifically asked for tuples, the following returns you an array of arrays - in other words, a list of tuples.

var parsed = JSON.parse('[{"name":"john", "place":"usa", "phone":"12345"},{"name":"jim", "place":"canada", "phone":"54321"}]');  var people = []; for (var i=0; i < parsed.length; i++) {    var person = [parsed[i].name, parsed[i].place, parsed[i].phone];    people.push(person); }