Difference between arr+=(','+i) vs arr.push(i)

Supriya25 · ‎07-15-2025

Hi All,

Can someone help me to understand what is difference between below two
When should we use : Arr.push(i) ;
When should we use : Arr + = ( ' , ' + i);

var criticalIncident = [];
var inc = new GlideRecord('incident');
inc.addActiveQuery();
inc.addQuery('priority', '1');
inc.addQuery('category', 'software');
inc.query();
while (inc.next()) {
criticalIncident.push(inc.number); OR criticalIncident+=(','+inc.number);
}
gs.info("Critical Incidents: " + criticalIncident);

Community Alums · ‎07-15-2025

When to use criticalIncident.push(inc.number);

Here, criticalIncident is an array.
.push() adds each incident number as a separate item in the array.
At the end, you can use .join(',') to turn that array into a single comma-separated string if you want to print it nicely.
This is the cleanest and recommended way, because you keep your data structured.

When to use criticalIncident += ',' + inc.number;

Here, criticalIncident is just a string, not an array.
You keep adding each incident number directly to that string, separated by commas.
This works too, but it can lead to things like an extra comma at the start, and you lose the benefit of having an actual array you can work with.

View solution in original post

Chaitanya ILCR · ‎07-15-2025

Hi @Supriya25 ,

var arr = '' (here arr is not an array it's a string)

var arr = [] (here arr is an array)

Better use the .push() method when dealing with arrays and use join() method to convert the array to string

string concatenation works but why to create a variable of type array and convert it to string at the same movement (you can directly initialize it as a string by setting value to var arr ='')

Please mark my answer as helpful/correct if it resolves your query.

Regards,
Chaitanya

View solution in original post

Community Alums · ‎07-15-2025

When to use criticalIncident.push(inc.number);

Here, criticalIncident is an array.
.push() adds each incident number as a separate item in the array.
At the end, you can use .join(',') to turn that array into a single comma-separated string if you want to print it nicely.
This is the cleanest and recommended way, because you keep your data structured.

When to use criticalIncident += ',' + inc.number;

Here, criticalIncident is just a string, not an array.
You keep adding each incident number directly to that string, separated by commas.
This works too, but it can lead to things like an extra comma at the start, and you lose the benefit of having an actual array you can work with.