ES5

javaScript

var i;
for (i = 0; i < substr.length; ++i) {
    // do something with `substr[i]`
}

var i;

for (i = 0; i < substr.length; ++i) {

// do something with `substr[i]`

}

jQuery.each(substr, function(index, item) {
    // do something with `item` (or `this` is also `item` if you like)
});

jQuery.each(substr, function(index, item) {

// do something with `item` (or `this` is also `item` if you like)

});

substr.forEach(function(item) {
    // do something with `item`
});

substr.forEach(function(item) {

// do something with `item`

});