How to loop through each entry in using For Loop JavaScript

Question

My loop function is as below

 var resources= jsonObj.entry;
 var resourceType;
 var i;
 for (i = 0; i < resources.length; i++) {
  resourceType += resources[i];
  }

  console.log(resourceType)

if i do jsonObj.entry[0] i get the first entry so i implemented for-loop to get all the entries but console.log on resourceType prints the following

Check out What is the difference between ( for… in ) and ( for… of ) statements in JavaScript? and.. aren't you forgetting to use the index on your code snippet there? — rmjoia
– rmjoia, Commented Feb 18, 2020 at 10:31
along with missing index like resorces[i] you should initialize resourceType with an empty string, like resourceType = "". — Gulam Hussain
– Gulam Hussain, Commented Feb 18, 2020 at 10:33
Are you wanting to change [object Object] or get rid of the undefined at the start? — Jacob
– Jacob, Commented Feb 18, 2020 at 10:34
You seem to be concatenating objects. (Doing something like {}.toString() + {}.toString()) Is this what you want? — evolutionxbox
– evolutionxbox, Commented Feb 18, 2020 at 10:36

rmjoia · Accepted Answer · 2020-02-18 13:00:17Z

1

So, one way to do it is

var resources = jsonObj.entry;
var resourceTypeArray = [];
var resourceType = "";

for (let item = 0; item <= resources.length; item++) {
  // This will remove all cases where the item doesn't exist and/or resource doesn't exist
  if(resources[item] && resources[item].resource){
      resourceTypeArray.push(resources[item].resource);  
      resourceType += JSON.stringify(resources[item].resource);
  }
}

// printing out to the console the array with resources
console.info(resourceTypeArray);

// printing out to the console the string with the concatenation of the resources
console.info(resourceType);

I also created a StackBlitz with the working solution and your json file kindly provided.

hope it helps.

answered Feb 18, 2020 at 13:00

rmjoia

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