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Created August 22, 2015 01:50
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variables variables // source https://jsbin.com/jihure
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="variables">
<meta charset="utf-8">
<title>variables</title>
</head>
<body>
<script id="jsbin-javascript">
/*
* VARIABLES:
*
* 0. To hold things in memory during the life-cycle of a program, we can use variables. Variables
* are named identifiers that can point to values of a particular type, like a Number, String,
* Boolean, Array, Object or another data-type. Variables are called so because once created, we
* can CHANGE the value (and type of value) to which they point.
*
* 1. To create a variable we use the keyword, var, followed by a name (id or alias) for our
* variable.
*
* 2. There are 2 phases of using variables: declaration and initialization (or assignment).
*/
// 1. declaration //
var myName;
/*
* At the declaration phase, the variable myName is undefined because we have NOT initialized
* it to anything
*/
console.log(myName); // prints => undefined
// 2. initialization or assignment //
myName = 'john';
console.log(myName); // prints => john
// 3. re-assignment //
myName = 'bob';
console.log(myName); // prints => bob
// NOTE: We can assign and re-assign anything to a variable - we cannot do this with constants //
var myVariable = 1;
var myVariable = true;
myVariable = "someString";
</script>
<script id="jsbin-source-javascript" type="text/javascript">/*
* VARIABLES:
*
* 0. To hold things in memory during the life-cycle of a program, we can use variables. Variables
* are named identifiers that can point to values of a particular type, like a Number, String,
* Boolean, Array, Object or another data-type. Variables are called so because once created, we
* can CHANGE the value (and type of value) to which they point.
*
* 1. To create a variable we use the keyword, var, followed by a name (id or alias) for our
* variable.
*
* 2. There are 2 phases of using variables: declaration and initialization (or assignment).
*/
// 1. declaration //
var myName;
/*
* At the declaration phase, the variable myName is undefined because we have NOT initialized
* it to anything
*/
console.log(myName); // prints => undefined
// 2. initialization or assignment //
myName = 'john';
console.log(myName); // prints => john
// 3. re-assignment //
myName = 'bob';
console.log(myName); // prints => bob
// NOTE: We can assign and re-assign anything to a variable - we cannot do this with constants //
var myVariable = 1;
var myVariable = true;
myVariable = "someString";</script></body>
</html>
Raw
jsbin.jihure.js
/*
* VARIABLES:
*
* 0. To hold things in memory during the life-cycle of a program, we can use variables. Variables
* are named identifiers that can point to values of a particular type, like a Number, String,
* Boolean, Array, Object or another data-type. Variables are called so because once created, we
* can CHANGE the value (and type of value) to which they point.
*
* 1. To create a variable we use the keyword, var, followed by a name (id or alias) for our
* variable.
*
* 2. There are 2 phases of using variables: declaration and initialization (or assignment).
*/
// 1. declaration //
var myName;
/*
* At the declaration phase, the variable myName is undefined because we have NOT initialized
* it to anything
*/
console.log(myName); // prints => undefined
// 2. initialization or assignment //
myName = 'john';
console.log(myName); // prints => john
// 3. re-assignment //
myName = 'bob';
console.log(myName); // prints => bob
// NOTE: We can assign and re-assign anything to a variable - we cannot do this with constants //
var myVariable = 1;
var myVariable = true;
myVariable = "someString";
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