CODEWITHSUNDEEP
javascript
Anver
Anver

Reputation: 41

by iterating I need to filter specific word using javascript, but I am not getting the expected value?

I need to filter the category type only but instead my code is returning the defined string.
My expected output is: funiture sofa galley.

var contextstr =
  'Lorem Ipsum is category:funiture dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since category:sofa 1500s, when an unknown printer took a category:galley of type and scrambled it to make a type';

var count = 0;
while (true) {
  var findpos = contextstr.indexOf('category:', count);
  if (findpos == -1) break;
  var startpos = findpos + 9;
  var endpos = contextstr.indexOf(' ', startpos);
  var printcat = contextstr.substring(startpos + endpos);
  document.write(printcat + '<br>');
  //x++;
  count = endpos + 1;
}

Upvotes: 0

Views: 56

Answers (4)

Brian Patterson
Brian Patterson

Reputation: 1625

can you give this a try ??

var contextstr =
  'Lorem Ipsum is category:funiture dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since category:sofa 1500s, when an unknown printer took a category:galley of type and scrambled it to make a type';

var pos = 0;
var printcat = '';
while (pos = contextstr.indexOf('category:')) {

  contextstr = contextstr.substring(pos+9);
  let cat = contextstr.substring(0, contextstr.indexOf(' '));
  contextstr = contextstr.substring(cat.length+1);
  printcat += cat + "<br>";

}
document.write(printcat);

Upvotes: 0

DCR
DCR

Reputation: 15685

change this line:

var printcat = contextstr.substring(startpos + endpos);

to:

var printcat = contextstr.substring(startpos,endpos);


var contextstr =
    
'Lorem Ipsum is category:funiture dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since category:sofa 1500s, when an unknown printer took a category:galley of type and scrambled it to make a type';
var x = 1;
var count = 0;
while (x=1) {
  var findpos = contextstr.indexOf('category:', count);
  if (findpos == -1) break;
  
  var startpos = findpos + 9;
  var endpos = contextstr.indexOf(' ', startpos);
  
  var printcat = contextstr.substring(startpos, endpos);
  
 document.write(printcat + '<br>');
  //x++;
  count = endpos + 1;
}

Upvotes: 1

Lauren Yim
Lauren Yim

Reputation: 14098

Try this:

const contextstr =
  'Lorem Ipsum is category:funiture dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since category:sofa 1500s, when an unknown printer took a category:galley of type and scrambled it to make a type';

const matches = [...contextstr.matchAll(/(?<=category:)\S+/g)];

document.write(`${matches.join('\n')}<br>`);

Explanation of /(?<=category:)\S+/g

/
  (?<=         positive lookbehind
    category:  matches anything with category: before it
  )            end of positive lookbehind
  \S           matches anything that's not a whitespace character
    +          ...if there are one or more of them
/g             global flag: match multiple times

Upvotes: 1

Luca Jung
Luca Jung

Reputation: 1440

Try this:

var contextstr =
  'Lorem Ipsum is category:funiture dummy text of the printing and typesetting industry. Lorem Ipsum has been the industrys standard dummy text ever since category:sofa 1500s, when an unknown printer took a category:galley of type and scrambled it to make a type';

var splitArray = contextstr.split("category:");
splitArray.shift(); //Remove first item (Stuff right before first 'category:')
splitArray.forEach(split => {
  document.write(split.split(" ")[0] + '<br>');
});

Upvotes: 2

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