Standard for loops

for (var i = 0; i < 100; i++) {
    console.log(i);
}

Expected output:

0 1 … 99

Commonly used to cache the length of an array.

var array = ['a', 'b', 'c'];
for (var i = 0; i < array.length; i++) {
    console.log(array[i]);
}

Expected output:

‘a’ ‘b’ ‘c’

for (var i = 0; i < 100; i += 2 /* Can also be: i = i + 2 */) {
    console.log(i);
}

Expected output:

0 2 4 … 98

for (var i = 100; i >=0; i--) {
    console.log(i);
}

Expected output:

100 99 98 … 0

Found a mistake? Have a question or improvement idea? Let me know.

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