Javascript Variables
Writing by shivdev on Thursday, 25 of October , 2007 at 4:46 pm
Remember, Javascript is not a strongly typed language. While using variables in Javascript, don’t bother about the type of data a variable is storing, instead what the variable is storing. These variables can store anything – even functions!! Here are some examples on using variables in Javascript.
var thisIsAString = 'This is a string';
var alsoAString = '25';
var isANumber = 25;
var isEqual = (alsoAString==isANumber); // This is true, they are both 25.
var isEqual = (alsoAString===isANumber); // False one is a number,
// the other a string.
var concat=alsoAString + isANumber; // concat is now 2525
var addition=isANumber + isANumber; // addition is now 50
var alsoANumber=3.05; // is equal to 3.05 (usually).
var floatError=0.06+0.01; // is equal to 0.06999999999999999
var anExponent=1.23e+3; // is equal to 1230
var hexadecimal = 0xff; // is equal to 255.
var octal = 0377; // is equal to 255.
var isTrue = true; // This is a boolean, it can be true or false.
var isFalse= false; // This is a boolean, it can be true or false
var isArray = [0, 'one', 2, 3, '4', 5]; // This is an array.
var four = isArray[4]; // assign a single array element to a variable.
// in this case four = '4'
var isObject = { 'color': 'blue', // This is a Javascript object
'dog': 'bark',
'array': [0,1,2,3,4,5],
'myfunc': function () { alert('do something!'); }
}
var dog = isObject.dog; // dog now stores the string 'bark';
isObject.myfunc(); // creates an alert box with the value "do something!"
var someFunction = function() {
return "I am a function!";
}
var alsoAFunction = someFunction; //No () so alsoAFunction becomes a function
var result = alsoAFunction(); // alsoAFunction is executed here because ()
// executes the function so result stores the
// return value of the function which is
// "I am a function!"
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Category: Javascript
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