map

The map() method creates a new array populated with the results of calling 
a provided function on every element in the calling array.

const array1 = [1, 4, 9, 16];

// pass a function to map
const map1 = array1.map(x => x * 2);

console.log(map1);
// expected output: Array [2, 8, 18, 32]

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Fotyna Abram 110 points

                                    {&quot;coord&quot;:{&quot;lon&quot;:69.4167,&quot;lat&quot;:34.5},&quot;weather&quot;:[{&quot;id&quot;:800,&quot;main&quot;:&quot;Clear&quot;,&quot;description&quot;:&quot;clear sky&quot;,&quot;icon&quot;:&quot;01d&quot;}],&quot;base&quot;:&quot;stations&quot;,&quot;main&quot;:{&quot;temp&quot;:294.37,&quot;feels_like&quot;:293.07,&quot;temp_min&quot;:294.37,&quot;temp_max&quot;:294.37,&quot;pressure&quot;:1008,&quot;humidity&quot;:20,&quot;sea_level&quot;:1008,&quot;grnd_level&quot;:811},&quot;visibility&quot;:10000,&quot;wind&quot;:{&quot;speed&quot;:1.72,&quot;deg&quot;:278,&quot;gust&quot;:1.88},&quot;clouds&quot;:{&quot;all&quot;:0},&quot;dt&quot;:1624587596,&quot;sys&quot;:{&quot;type&quot;:1,&quot;id&quot;:7381,&quot;country&quot;:&quot;AF&quot;,&quot;sunrise&quot;:1624579865,&quot;sunset&quot;:1624631919},&quot;timezone&quot;:16200,&quot;id&quot;:1138957,&quot;name&quot;:&quot;Kabul&quot;,&quot;cod&quot;:200}

Thank you! 8

4.5

Rian Mostert 110 points

                                    Map&lt;String, String&gt; words = new HashMap&lt;&gt;();
words.put(&quot;apple&quot;, &quot;alma&quot;);
words.put(&quot;peer&quot;, &quot;k&ouml;rte&quot;);

System.out.println(words.get(&quot;apple&quot;)); // alma

words.put(&quot;apple&quot;, &quot;Apfel&quot;); // Fel&uuml;l&iacute;rja az &eacute;rt&eacute;ket
System.out.println(words.get(&quot;apple&quot;)); // Apfel

Set&lt;String&gt; keys = words.keySet(); // Kulcsok
Collection&lt;String&gt; values = words.values(); // &Eacute;rt&eacute;kek

for (Map.Entry&lt;String, String&gt; entry: words.entrySet()) {
    System.out.println(entry.getKey() + &quot; - &quot; + entry.getValue());
}

Thank you! 4

4.5 (4 Votes)

3.75

Great_helper 80 points

                                    om sharma

Thank you! 4

3.75 (4 Votes)

4.67

Alex 90 points

                                    LIST: Can store duplicate values,
      Keeps the insertion order. 
      It allows multiple null values, 
      Also we can read a certain value by index.
- ArrayList not syncronized, array based class 
- LinkedList not synchronized, doubly linked
- Vector is synchronized, thread safe

SET: Can only store unique values, 
     And does not maintain order
- HashSet can have null, order is not guaranteed
- LinkedHashSet can have null and keeps the order 
- TreeSet sorts the order and don't accept null 

QUQUE : Accepts duplicates, 
        Doesn't have index num,
        First in first our order.  
       
MAP : is a (key-value format) 
      and keys are always unique, 
      and value can be duplicated. 
- HashTable don't have null key, sychronized(thread-safe)
- LinkedHashMap can have null key, keeps order
- HasHMap can have null key, order is not guaranteed
- TreeMap doesn't have null key and keys are sorted

Thank you! 3

4.67 (3 Votes)

Published 95 points

                                    for (let {title, artist} of songs) {
  return title
}

Thank you! 1

5 (1 Votes)

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