Learning JavaScript Data Structures and Algorithms - Third Edition

Iterating each ValuePair of the dictionary with forEach

So far, we have not created a method that allows us to iterate through each value stored in the data structures. We are going to implement the forEach method for the Dictionary class, but we can use this same logic for the other data structures we created previously in the book as well.

The forEach method is as follows:

forEach(callbackFn) {  const valuePairs = this.keyValues(); // {1}  for (let i = 0; i < valuePairs.length; i++) { // {2}    const result = callbackFn(valuePairs[i].key, valuePairs[i].value); // {3}    if (result === false) {       break; // {4}    }  }}

First, we will retrieve the ValuePair array from the dictionary ({1}). Next, we will iterate each ValuePair ({2}) and we will evoke the ...