At what time we need this parameter...

Question

At what time we need this parameter of the "FOR"??
Can be example please??

for (; i < 10; ) {
}

Answer 1

It's the condition to check if we enter the loop or not.

for (var i = 0; i < 10; i++) {
...
}

is equivalent to

var i = 0;
while (i < 10) {
...
i++;
}

Answer 2

You will need to use "for" everytime you need to print any information.

Example of a code which search a variable for ofensive words:

var ofensiveWords = ['ofense', 'ofense2', 'ofense3'];

function verifyWords() {
for (i = 0; i < ofensiveWords.length; i++) {
/* HERE GOES THE CODE TO DISPLAY
OR ACT IF A WORD IS OFENSIVE */
}
}