Question

How to iterate over map in JavaScript

Answer 1

let mp = new Map();
  
mp.set("JavaScript", 23);
mp.set("Java", 89);
mp.set("C", 31);
mp.set("C++", 93);
mp.set("PHP", 77);
 
for (let entry of mp.entries()) {
    console.log(entry[0], entry[1]);    
}
  
  
       
       
/*
run:
       
"JavaScript", 23
"Java", 89
"C", 31
"C++", 93
"PHP", 77
       
*/

 

70+ SQL courses for beginners and professionals

Answer 2

let mp = new Map();
  
mp.set("JavaScript", 23);
mp.set("Java", 89);
mp.set("C", 31);
mp.set("C++", 93);
mp.set("PHP", 77);
 
for (let [key, value] of mp) {
    console.log(key, value);            
}
  
  
       
       
/*
run:
       
"JavaScript", 23
"Java", 89
"C", 31
"C++", 93
"PHP", 77
       
*/

 

70+ SQL courses for beginners and professionals

Answer 3

const mp = new Map([["typescript", 5], ["javascript", 4], ["nodejs", 9], ["c++", 2]])

mp.forEach((value, key) => {
    console.log(key, value);
});

 
 
 
   
/*
run:
        
"typescript", 5
"javascript", 4
"nodejs", 9
"c++", 2
           
*/
 

 

70+ SQL courses for beginners and professionals