Question

How to increment a value in a map with 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('JavaScript', mp.get('JavaScript') + 100 || 1);
mp.set('C', mp.get('C') + 300 || 1);

for (let entry of mp.entries()) {
    console.log(entry[0], entry[1]);    
}
   
   
        
        
/*
run:
        
"JavaScript", 123
"Java", 89
"C", 331
"C++", 93
        
*/

 

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