How to remove the following/trailing comma on the final value (javascript)?

Question

As the title suggests I'm trying to remove the last "," that appears when i return my function relative to a specific inputted name: For example I'm getting the following returned: "cat,bird,tiger, " when I'm trying to return "cat,bird,tiger " i have tried string = string.replace(/,\s*$/, ""); but this replaces all commas. here is my current code.

let string = "";

for(let i = 0; i < result.length; i++) {
  console.log(result[i].animal)
  string = string + result[i].animal + ",";
}
if(string != ""){
console.log(string);
}
else{
  console.log("NOT FOUND");
}

CertainPerformance · Accepted Answer · 2020-03-15 05:06:51Z

3

Map the array to the animal properties, then join by a comma instead:

const string = result.map(({ animal }) => animal).join(',');

To tweak your original code, add a comma to the beginning of the concatenated string if string is not empty:

let string = '';
for(let i = 0; i < result.length; i++) {
  string += (string ? ',' : '') + result[i].animal;
}

answered Mar 15, 2020 at 5:06

CertainPerformance

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2 Comments

Zaq Over a year ago

thank you so much, the tweaked code worked. As a beginner can you explain what the code in the parenthesis is doing exactly and give it some context on how that did what i was after?

CertainPerformance Over a year ago

It destructures the animal property from the object being iterated over and extracts only that value from every object, creating a new array. It's like .map(r => r.animal). Then all you need to do is join the array of strings.

MBadrian · Accepted Answer · 2020-03-15 05:14:36Z

0

i use this code for everywhere i want have like this string

 item,item,item,item,....,item

in first time i didn't add any comma and after then first add comma and then add item

if(string!=""){
        string+=","
      }

let string = "";

for(let i = 0; i < result.length; i++) {
  if(string!=""){
    string+=","
  }
  console.log(result[i].animal)
  string = string + result[i].animal ;
}
if(string != ""){
console.log(string);
}
else{
  console.log("NOT FOUND");
}

answered Mar 15, 2020 at 5:14

MBadrian

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