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Created August 20, 2015 18:09
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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 name 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 name 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 name 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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