Get Lazy in javascript coding
Lazy ways of coding in javascript.
Array Creation
Normal way
var a = new Array();
Lazy way
var a = [];
String to Number Conversion
Normal way
var num = parseInt('100');
Lazy way
var num = '100'*1;
Number to String Conversion
Normal way
var str = 100.toString();
Lazy way
var str = '' +100;
var str = +100;
Object creation
Normal way
var obj = new Object();
var obj = Object.create(null);
Lazy way
var obj = {};
Written by Arjunkumar
Related protips
8 Responses
Nice. :)
Code is getting a bit unreadable, especially for newbies.
String to Number conversion: prepend a plus sign.
var num = +'100'
tx. updated.
I'm not sure most of this would be a good idea for myself looking this code a year later, let alone a junior dev trying to maintain it...
Principle of least surprise says:
// clear: this variable is a number.
var numberizedString = Number("100");
// easy-to-miss unary plus, easy to mistake as binary plus
var lazyWay = +'100';
// clear: this variable is a string
var stringifiedNumber = 100..toString();
// not obvious: we're concatenating an empty string? Why?
var lazyWay = '' + 100; 
The Number to String Conversion is not lazy
The prepended plus sign is also a nice lazy way to get the current time in milliseconds
var time = new Date().getTime();vs
vat time = +new Date();
I am also hesitant about the number to string conversions. They are not that lazy but most important, it could confuse some inexperienced programmers. To make my code readable to others, I would accept (and encourage) the lazy way to create empty array and object, but not the type conversions suggested.
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