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Leno Marin
Courses Plus Student 1,323 PointsWhy the "html+= "
In this code: var html = '';
for (var i = 1; i<=100; i++){ html = html + '<div>' + i + '</div>'; }
document.write(html);
Why does the html declaration inside of the for loop block need to be written as such :html = html + '<div>' + i + '</div>'; }.
Versus just: html = '<div>' + i + '</div>'; ?
2 Answers
Michal Zuber
3,472 Pointshtml = html + '<div>' + i + '</div>';
This code assigns whatever was in html variable before and adds div with i inside. If you use this:
html = '<div>' + i + '</div>';
It will reassign variable's value, so each time this assignment is done you will lose previous value stored in html. That's why you need to use first snippet or if you prefer shorthand you may use:
html += '<div>' + i + '</div>';
Operator += does the same thing as writing html = html + '<div>' + i + '</div>';
nfs
35,526 PointsCan anyone make it clear why this var HTML is written is the first place??? I don't get the point