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jitensachdeva/decorator.js

Created July 23, 2014 09:59
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Implement a Logger function that accepts a function you specify wraps it with a function that logs the start time and the finish time to the console and returns the decorated function. Demonstrate it by decorating an add function that accepts two numbers and returns the sum, and now also logs the start time and end time.
Raw
decorator.js
function getDateTime() {
var now = new Date();
var year = now.getFullYear();
var month = now.getMonth()+1;
var day = now.getDate();
var hour = now.getHours();
var minute = now.getMinutes();
var second = now.getSeconds();
if(month.toString().length == 1) {
var month = '0'+month;
}
if(day.toString().length == 1) {
var day = '0'+day;
}
if(hour.toString().length == 1) {
var hour = '0'+hour;
}
if(minute.toString().length == 1) {
var minute = '0'+minute;
}
if(second.toString().length == 1) {
var second = '0'+second;
}
var dateTime = year+'/'+month+'/'+day+' '+hour+':'+minute+':'+second;
return dateTime;
}
var add = function(a,b) {
console.log(a+b);
return a+b;
};
var subtract = function(a,b){
console.log(a-b);
return a-b
}
var decorator = function (block){
return function(){
console.log("start time - " + getDateTime() );
block.apply(this,arguments);
console.log("end time -" + getDateTime());
}
};
var addDecorated = decorator(add);
addDecorated(1,2);
var subtractDecorated = decorator(subtract);
subtractDecorated(3,4)
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