How To Construct A Long String

I need to construct a long string with javascript. Thats how i tried to do it: var html = '

 

'; for(i = 1; i <= 400; i++){

Solution 1:

I assume you mean html += html;.

If you do that, your html string's length will be 37 × 2 = 9.5 × 10 which is beyond the limit of any browsers, on any computers, in any known universes can handle.

If you just want to repeat that string 400 times, use

var res = "";
for (var i = 0; i < 400; ++ i)
   res += html;
return res;

or

var res = [];
for (var i = 0; i < 400; ++ i)
   res.push(html);
return res.join("");

See Repeat String - Javascript for more options.

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Solution 2:

String concatenation is very slow in some browsers (coughIE6*cough*). Joining an array should be much quicker than looping with concatenation:

var arr = new Array(401);
var html = arr.join('<div style="balbalblaba">&nbsp;</div>');

Solution 3:

Another way to do it is by create an Array of stings then using Array.join(''). This is effectively the Python way of building strings, but it should work for JavaScript as well.

Solution 4:

var src = '<div style="balbalblaba">&nbsp;</div>';
var html = '';
for(i = 1; i <= 400; i++){
   html=+src;
};

Your code is doubling the string 400 times.