CODEWITHSUNDEEP
javascriptangulartypescript
Muhammad Ahsan
Muhammad Ahsan

Reputation: 679

Values in map object are not being incremented

I am doing analysis on an array of strings named wordList: string[] = [];

This contains a long list of strings.

Problem: I have a map object whose key is a string type and value is of type number.

Here is my code.

private rankMostFrequent5Words(): void {

    this.wordList.forEach((word:string) => {

     if(!this.mapObject.has(word)) {

        this.mapObject.set(word, 1)
     }
     else {
        this.mapObject[word]++;
     }
    });
  }

My desired output is: if a key already exists in the map then increment the number by 1 and if it does not exist set this key and count to 1.

Actual output:

What I get in browser console

How can I fix this ? Please guide.

Upvotes: 2

Views: 70

Answers (1)

Tomasz Kula
Tomasz Kula

Reputation: 16837

You cannot access map values with bracket syntax. You must use the .get method.

if(!this.mapObject.has(word)) {
  this.mapObject.set(word, 1)
} else {
  this.mapObject.set(word, this.mapObject.get(word) + 1)
}

Read more about Map.

Upvotes: 1

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