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showing results for - "javascript map foreach"
Mimi
26 Jan 2018
1// 1. for-each with Entry
2Map<Integer, Integer> map = new HashMap<Integer, Integer>();
3for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
4    System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
5}
6
7
8// 2. for-each with key or value each (faster)
9Map<Integer, Integer> map = new HashMap<Integer, Integer>();
10//iterating over keys only
11for (Integer key : map.keySet()) {
12    System.out.println("Key = " + key);
13}
14 
15//iterating over values only
16for (Integer value : map.values()) {
17    System.out.println("Value = " + value);
18}
19
20
21// 3. Using Iterator
22Map<Integer, Integer> map = new HashMap<Integer, Integer>();
23// With Generic
24Iterator<Map.Entry<Integer, Integer>> entries = map.entrySet().iterator();
25while (entries.hasNext()) {
26    Map.Entry<Integer, Integer> entry = entries.next();
27    System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
28}
29
30// No Generic
31Map map = new HashMap();
32Iterator entries = map.entrySet().iterator();
33while (entries.hasNext()) {
34    Map.Entry entry = (Map.Entry) entries.next();
35    Integer key = (Integer)entry.getKey();
36    Integer value = (Integer)entry.getValue();
37    System.out.println("Key = " + key + ", Value = " + value);
38}
39
source
Zach
21 Feb 2020
1Object.keys(obj).forEach(function (key) {
2   // do something with obj[key]
3});
source
Amelie
13 Oct 2020
1const myArray = ['Sam', 'Alice', 'Nick', 'Matt'];
2
3// Appends text to each element of the array
4const newArray = myArray.map(name => {
5	return 'My name is ' + name; 
6});
7console.log(newArray); // ['My name is Sam', 'My Name is Alice', ...]
8
9// Appends the index of each element with it's value
10const anotherArray = myArray.map((value, index) => index + ": " + value);
11console.log(anotherArray); // ['0: Sam', '1: Alice', '2: Nick', ...]
12
13// Starting array is unchanged
14console.log(myArray); // ['Sam', 'Alice', 'Nick', 'Matt']
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