Unable to access data beyond the function boundaries

Currently, I am diving into the world of JavaScript and AngularJS. My goal is to utilize values that exist outside of a function, yet I'm struggling with how to effectively access them.

Below is a snippet of my code (AngularJS Controller):

var init = function() {
    $http.get('getSomeValues').then(function (res) {
        var returnArray = res.data; // An array as a result

        for(var i=0; i < returnArray.length; i++) { // Looping through the array
            console.log("THIS WORKS AS EXPECTED: ", returnArray[i].value); // Log the value
            $http.get('getOtherValues/' + returnArray[i].value).then(function (res) {
                console.log("WHAT'S INSIDE: ", returnArray[i].value); // Displays 'undefined' error
            });
        }
    });
};
init();

Essentially, my challenge lies in accessing the returnArray, which is proving to be quite elusive. Is there a better method for me to access these values? Could it possibly be related to the use of '.then(function...' triggering an error?

Answer №1

To properly handle the situation, you should implement an Immediately Invoked Function Expression (IIFE):

Instead of:

for(var i=0; i < returnArray.length; i++) { // Loop through the array
    $http.get('getOtherValues/' + returnArray[i].value).then(function (res) {
        console.log("WHAT'S IN IT: ", returnArray[i].value); // Shows 'undefined' error
    });
}

Use this code snippet instead:

for(var i=0; i < returnArray.length; i++) { // Loop through the array
    (function(data){
        $http.get('getOtherValues/' + data.value).then(function (res) {
            console.log("WHAT'S IN IT: ", data.value); // Shows 'undefined' error
        });
    }(returnArray[i]))
}

This modification ensures that each iteration of the for loop assigns the correct value to the data variable based on the current item in the raturnArray.

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