empty string or null check within loop

Question

var imageArr = [];
if(req.body.photo1){
  imageArr.push(req.body.photo1);
}
if(req.body.photo2){
  imageArr.push(req.body.photo2);
}
if(req.body.photo3){
  imageArr.push(req.body.photo3);
}
if(req.body.photo4){
  imageArr.push(req.body.photo4);
}

How to improve above code? I wrote a loop but I got undefined1,undefined2,undefined3,undefined4 value in my array.

for(var i = 1; i<=4;i++){
if(req.body.photo+''+i){
imageArr.push(req.body.photo+''+i);
}
}

Rajesh Dixit · Accepted Answer · 2016-01-15 14:11:07Z

3

since "photo" + i is a variable key, you need to access it as req.body [ "photo" + 1 ]

for(var i = 1; i<=4;i++)
{
  var value = req.body[ "photo"+ i];
  if( value ) 
  {
    imageArr.push(value);
  }
}

edited Jan 15, 2016 at 14:11

Rajesh Dixit

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answered Jan 15, 2016 at 9:05

gurvinder372

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1 Comment

Jennifer Over a year ago

is assigning it to a value variable compulsory?

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