Array to dictionary javascript

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8 Answers

dictionaryjavascriptarray
90%

How to add an object to an array in JavaScript ?,How to push an array into the object in JavaScript ?,How to check a key exists in JavaScript object?,How to append HTML code to a div using JavaScript ?

Example_snippet/controller/utility/_dictionary.js/ var dict = { key1 : value1 , . . .
var dict = {
   key1: value1,
   key2: value2,
   ....
};
Step 2 continued with var dict = {};. . .
var dict = {};
Step 3 continued with dict[new_key] = new_value;. . .
dict[new_key] = new_value;
Step 4 continued with dict.new_key = new_value;. . .
dict.new_key = new_value;
Step 5 continued with var value = dict[key];. . .
var value = dict[key];
Step 6 continued with var value = dict.key;. . .
var value = dict.key;
Step 7 continued with for(var key in dict) { cons. . .
for (var key in dict) {
   console.log(key + " : " + dict[key]);
}
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88%

You can also initialize the Dictionary with Key/Value pairs when creating it if you are using the shorthand method,,Hopefully this offers some additional clarification and/or insights into how JavaScript works, and how to make it work how you want/need it to

Example_snippet/controller/utility/_dictionary.js/ var dict = new Object(); // o. . .
var dict = new Object();

// or the shorthand way
var dict = {};
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72%

The use case is to convert an array of objects into a hash map based on string or function provided to evaluate and use as the key in the hash map and value as an object itself, A common case of using this is converting an array of objects into a hash map of objects

Example_snippet/controller/utility/_dictionary.js/ var arr = [ { key: 'foo', . . .
var arr = [{
      key: 'foo',
      val: 'bar'
   },
   {
      key: 'hello',
      val: 'world'
   }
];

var result = arr.reduce(function(map, obj) {
   map[obj.key] = obj.val;
   return map;
}, {});

console.log(result);
// { foo:'bar', hello:'world' }
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65%

Example_snippet/controller/utility/_dictionary.js/ var dict = []; // create an em. . .
var dict = []; // create an empty array

dict.push({
   key: "keyName",
   value: "the value"
});
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75%

If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:

Example_snippet/controller/utility/_dictionary.js/ keys(). . .
keys()
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40%

The Object,values() method returns an array of a given object's own enumerable property values, in the same order as that provided by a for

Example_snippet/controller/utility/_dictionary.js/ Object.values(obj) . . .
Object.values(obj)
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22%

The easiest way for converting an array of objects to a dictionary in JavaScript / TypeScript: ,Built on Forem — the open source software that powers DEV and other inclusive communities,,DEV Community – A constructive and inclusive social network for software developers

Example_snippet/controller/utility/_dictionary.js/ let data = [ {id: 1, country. . .
let data = [{
      id: 1,
      country: 'Germany',
      population: 83623528
   },
   {
      id: 2,
      country: 'Austria',
      population: 8975552
   },
   {
      id: 3,
      country: 'Switzerland',
      population: 8616571
   }
];

let dictionary = Object.assign({}, ...data.map((x) => ({
   [x.id]: x.country
})));
// {1: "Germany", 2: "Austria", 3: "Switzerland"}
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60%

We are required to write a JavaScript function that takes in one such array and constructs an object where name value is the key and the score value is their value,,Appending a key value pair to an array of dictionary based on a condition in JavaScript?,How to access an object value using variable key in JavaScript?,Use the Array

Example_snippet/controller/utility/_javascript.js/ const arr = [ {"name": "Rahul". . .
const arr = [{
      "name": "Rahul",
      "score": 89
   },
   {
      "name": "Vivek",
      "score": 88
   },
   {
      "name": "Rakesh",
      "score": 75
   },
   {
      "name": "Sourav",
      "score": 82
   },
   {
      "name": "Gautam",
      "score": 91
   },
   {
      "name": "Sunil",
      "score": 79
   },
];
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