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- /*
- * 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";
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