What's Math Constants and Functions using JavaScript?

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The Math object contains useful constants such as Math.PI, Math.E

Math also has a zillion helpful functions.

Math.abs(value); //absolute value

Math.max(value1, value2); //find the largest

Math.random() //generate a decimal number between 0 and 1

Math.floor(Math.random()*101) 
//generate a decimal number between 0 and 100

2011-07-05, 3726👍, 0💬

General technical question
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How to delete an entry using JavaScript?
How to delete an entry using JavaScript? The "delete" operator removes an array element, but oddly does not change the size of the array. <script type="text/javascript"> var days = ["Sunday","Monday","Tuesday"," Wednesday","Thursday","Friday","Saturday" ];document.write("Number of days:"+days... 2011-07-19, 4203👍, 0💬

How tp create Arrays using JavaScript??
How tp create Arrays using JavaScript?? <script type="text/javascript"> var days = new Array(); days[0] = "Sunday" days[1] = "Monday" days[2] = "Tuesday" days[3] = "Wednesday" days[4] = "Thursday" days[5] = "Friday" days[6] = "Saturday" document.write("first day is "+days[0]) </script>... 2011-07-12, 4203👍, 0💬

How to use strings as array indexes using JavaScript?
How to use strings as array indexes using JavaScript? Javascript does not have a true hashtable object, but through its wierdness, you can use the array as a hashtable. <script type="text/javascript"> var days = ["Sunday","Monday","Tuesday"," Wednesday","Thursday","Friday","Saturday" ];for(va... 2011-07-19, 4060👍, 0💬

What's the Date object using JavaScript?
What's the Date object using JavaScript? Time inside a date object is stored as milliseconds since Jan 1, 1970. new Date(06,01,02) // produces "Fri Feb 02 1906 00:00:00 GMT-0600 (Central Standard Time)" new Date(06,01,02).toLocaleString( )// produces "Friday, February 02, 1906 00:00:00" new Date(06,... 2011-07-05, 3960👍, 0💬

How to convert numbers to strings using JavaScript?
How to convert numbers to strings using JavaScript? You can prepend the number with an empty string var mystring = ""+myinteger; or var mystring = myinteger.toString(); You can specify a base for the conversion, var myinteger = 14; var mystring = myinteger.toString(16); mystring will be "e". 2011-06-21, 3948👍, 0💬

How to convert a string to a number using JavaScript?
How to convert a string to a number using JavaScript? You can use the parseInt() and parseFloat() methods. Notice that extra letters following a valid number are ignored, which is kinda wierd but convenient at times. parseInt("100") ==> 100 parseFloat("98.6") ==> 98.6 parseFloat("98.6 ... 2011-06-21, 3939👍, 0💬

How to test for bad numbers using JavaScript?
How to test for bad numbers using JavaScript? The global method, "isNaN()" can tell if a number has gone bad. var temperature = parseFloat(myTemperatureWidget .value);if(!isNaN(temperature)) { alert("Please enter a valid temperature."); } 2011-06-28, 3812👍, 0💬

What's Math Constants and Functions using JavaScript?
What's Math Constants and Functions using JavaScript? The Math object contains useful constants such as Math.PI, Math.E Math also has a zillion helpful functions. Math.abs(value); //absolute value Math.max(value1, value2); //find the largest Math.random() //generate a decimal number between 0 and 1 ... 2011-07-05, 3727👍, 0💬

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