js_tutorial

Javascript
var from = Number(arguments[1]) || 0;
from = (from < 0)
? Math.ceil(from)
: Math.floor(from);
if (from < 0)
from += len;
}
for (; from < len; from++)
{
if (from in this &&
this[from] === elt)
return from;
}
return -1;
};
function printBr(element, index, array) {
}
document.write("[" + index + "] is " + element );
var index = [12, 5, 8, 130, 44].indexOf(8);
document.write("index is : " + index );
var index = [12, 5, 8, 130, 44].indexOf(13);
document.write("index is : " + index );
Output
index is : 2
index is : -1
193