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JavaScript - Ways To Create Arrays?
Does anyone know of a way I can create an array using words on new lines, without quotes, or a way I can make all of the lines separately in quotes and separated by commas? (I have 118,628 words, so I can't do it by hand.) Any help is appreciated. Thanks to anyone who answers.
Similar TutorialsI'm still a beginner in js core so please forgive if the question is too fundamental. In the following example PositionedRectangle is a subclass of Rectangle, all 3 methods of prototype inheritance seem to produce the same results, method 1 is from the authors book (Flanagan's Definitive Guide 5ed) example 9-3, and method 2 is from his website example 9-3, and method 3 is my own; Code:
// method 1 seems most complicated
function heir(p) {
function f(){};
f.prototype =p;
return new f();
}
PositionedRectangle.prototype = heir(Rectangle.prototype);
//method 2
PositionedRectangle.prototype = new Rectangle();
//method 3 seems most straight forward (I don't know if it's correct but works ok)
PositionedRectangle.prototype = Rectangle.prototype;
Thank you Gents, J. Hi everyone, i am stuck at a problem. i am trying to craete a redimmensionable array using javascript, is there a way to do this, i know that this can be done in vbscript using redim and preserve commands. If not then is it possible to variables between javascript and vbscript, or call vbscript function using javascript. a sample code will be much aprreciated thanks for your time! J Hey I was hoping someone could point me in the right direction here. I'm supposed to add a <script> in the mainContent div of puppies.htm to generate the opening table tags followed by a header row with cells for Picture, Description, and Date Taken. Obviously these are supposed to be taken from the arrays in puppies.js, but how do i organize those arrays into a table. Any input would be much appreciated. thanks. puppies.js Code: var puppyPics = new Array(); var pictureDesc = new Array(); var pictureDate = new Array(); puppyPics[0] = "AllTheKids.jpg"; puppyPics[1] = "susie.jpg"; puppyPics[2] = "princess.jpg"; puppyPics[3] = "wicketAndCarlos.jpg"; puppyPics[4] = "wicketAndGeorge.jpg"; pictureDesc[0] = "New puppies"; pictureDesc[1] = "Susie"; pictureDesc[2] = "This is Princess"; pictureDesc[3] = "Wicket is very social"; pictureDesc[4] = "Wicket and George"; pictureDate[0] = "January 10, 2011"; pictureDate[1] = "January 10, 2011"; pictureDate[2] = "January 10, 2011"; pictureDate[3] = "January 15, 2011"; pictureDate[4] = "January 15, 2011"; puppies.htm Code: <div id="mainContent">
<h1> My Puppies</h1>
<p>I made this page to show off my wonderful puppies! I hope you enjoy their pictures.</p>
<script
<!-- end #mainContent --></div>
I was looking at that old Strawberry Fields problem and I thought I'd see about solving it in JavaScript. What I want is an array of chars so that I can set individual elements in the array of arrays. Strings are apparently immutable and can't directly be changed? Here's my code. Code: var field = new Array();
var string0 = "..@@@@@..............."
var string1 = "..@@@@@@........@@@..."
var string2 = ".....@@@@@......@@@..."
var string3 = ".......@@@@@@@@@@@@..."
var string4 = ".........@@@@@........"
var string5 = ".........@@@@@........"
for (var i = 0; i < 6; i++) {
field[i] = new Array();
field[i] = eval("string" + i + ".slice('')");
}
document.write("field's type is " + typeof field + "<br>"); // object? but it should be explicit array
document.write(typeof field[1]) // string? it should explicitly be an array, then it was filled with array elements
document.write(typeof field[1][2]); // string - ok, I understand this bit
document.write(field[1].length);
document.write("<br>");
for (var i = 0; i < field.length; i++) {
field[i] = new Array();
for (var k = 0; k < eval("string" + i + ".length"); k++) {
field[i][k] = eval("string" + i + ".charAt(" + k + ")");
}
document.write("<br>");
}
document.write("field's type is " + typeof field + "<br>"); // seriously, an object?
document.write(typeof field[1]) // why is this an object instead of an array?
document.write(typeof field[1][2]); // string, yeah, I understand this as well
document.write(field[1].length);
document.write("<br>");
Also, it looks like I can't overwrite a 1-length string that's in the array of arrays. For instance: Code: newField = field; //for loops newField[i][k] = 0; // does nothing, newField's elements remain the same. I need to loop the alphabet and numbers 0-9 to initialize a few thousand arrays. This is for my site and is truly needed. http://www.thefreemenu.com I currently have every array written out and it takes up to much space in my .js file. The majority of my variables are empty but necessary and need to be there (including empty) for my site to work properly. Question is the last part Here's where I'm at. Code: var NewVarLetterOrNum = "a";
eval("_oneofseveralnames_" + NewVarLetterOrNum + "='this part works';");
alert(_oneofseveralnames_a);
This creates the variable _oneofseveralnames_a='this part works' Code: var newArrayLetterOrNum = "a";
eval("_oneofseveralnames_" + newArrayLetterOrNum + "= new Array();");
alert(_oneofseveralnames_a)
This creates the Array _oneofseveralnames_a=new Array(); and all the values in the array are null, but, now a variable like _nl_a[1]='something' can be used elsewhere because the array exists. This is all that is necessary for now because I can probably set all the variables to be blank with something like Code: i=1
while(i<=20){
_oneofseveralnames_a[i]="1-20";
i++
}
alert(_oneofseveralnames_[20]);
So now you have what I came to understand in the first few hours. Now to the hard part : ( I can't make multiple array's dynamically. I dont' know if its because I don't understand loops or arrays or what and its very fustrating. As for any answer you might be so kind as to provide, if you could dumb it down that would be greatly appreciated. Code: var newArray =new Array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z')
i=1
while(i<=26){
eval("_nl_" + newArray[i] + "= new Array();");
i++
}
alert(newArray[1]) // Is b, but
alert(_nl_b) //I can't get _nl_b to exist, I tried everything including taking away the quotes around the letters in every test
*/
var _nl_a =new Array()
var _img_a =new Array()
var _h_a =new Array()
var _r_a =new Array()
var _m_a =new Array()
var _yt_a =new Array()
var _i_a =new Array()
The above arrays are all the array _name_ parts I need but for example, a has 10 parts, a,p2_a,p3_a,.. p10_a. I need 10 pages for each letter of the alphabet and numbers 0-9 and a special all1, p2_all1 ... p10_all1. Overall 2200 arrays that need to be declared. Currently they are all written out.
/*
Code: <HTML>
<HEAD>
<TITLE>Listing 4.4</TITLE>
<SCRIPT TYPE="text/javascript">
//DEFINE METHOD
function displayInfo() {
document.write("<H1>Employee Profile: " + this.data[0] + "</H1><HR /><PRE>");
document.writeln("Employee Number: " + this.data[1]);
document.writeln("Social Security Number: " + this.data[2]);
document.writeln("Annual Salary: " + this.data[3]);
document.write("</PRE>");
}
//DEFINE METHOD TO GET EMPLOYEE INFORMATION
function getInfo() {
var menu="0-Exit/1-Name/2-Emp. #/3-Soc. Sec. #/4-Salary";
var choice=prompt(menu,"0");
if (choice != null) {
if ((choice < 0) || (choice > 4)) {
alert ("Invalid choice");
this.getInfo();
} else {
if (choice != "0") {
this.data[choice-1]=prompt("Enter information","");
this.getInfo();
}
}
}
}
//DEFINE OBJECT
function employee() {
this.data = new Array(4);
this.displayInfo=displayInfo;
this.getInfo=getInfo;
}
newEmployee=new employee();
</SCRIPT>
</HEAD>
<BODY>
<SCRIPT TYPE="text/javascript">
newEmployee.getInfo();
newEmployee.displayInfo();
</SCRIPT>
</BODY>
</HTML>
I am currently taking a Javascript certification course, this is a exercise given (final code) I don't completely understand what is going on though, could someone explain to me Code: this.data[choice-1]=prompt("Enter information","");
that part? I don't understand why, [choice-1] I don't fully understand why an array is even needed here? First of all thank you for reading my thread and giving time to help me. Here goes my question: How to sort this array? MY PRIORITY COLORS array: ------------ green , yellow ALL COLORS array : <---- this will be your main array. ----------------------- pink , green , orange THE RESULTS: ( the results after you sort) (Not sorted by alphabetically, but sorted by the priority colors) ---------------- green , pink , orange I hope you could help me solve this javascript sorting problem. Thank you! Hi. I am fairly new to JavaScript. I am having some troubles with arrays. I am using Chrome 12 beta. Here is a brief version of the code I am having trouble with Code: var array=new Array() array[0]=new Array() array[0][1]=new Array() var array[0][1]=[ 3, 1, 4, 1, 5, 9, 2, 6, 5, ... ]; I do not want to use "array[0][1][n]" because my array has too many items to do that and it is just plain annoying to change the numbers that way. I get an error on the "var buffers[0][1]=[" line saying: "Uncaught SyntaxError: Unexpected token [" What is the problem in my code? Thank you ahead of time. ---mint Hi could someone help with this javascript. i dont know where to start with the script which is in bold. Program to report the results of an election. // candidates var candidateArray = ['Mr R Green...', 'Ms O Brown...', 'Ms Y Black...', 'Mr G White...', 'Ms B Grey....','Ms I Blue....', 'Mr V Pink....']; // online votes var onlineVotesArray = [21,47,23,11,56,47,30]; // paper votes var paperVotesArray = [12,4,20,11,5,4,17]; // total votes -- to be initialised below var totalVotesArray; // Add code to // -- initialise totalVotesArray with a new empty array of the same size as candidateArray // -- use a for loop to add the online and paper votes for each candidate and store the result at the corresponding position in the total votes array. Got this script from the Sam's Teach Yourself Javascript In 24 Hours book, and I'm a little confused with regards to this script I came across, or more specifically, the part of the script I've outlined in red. Code: <script language="javascript" type="text/javascript">
function numcompare(a,b) {
return a-b;
}
nums = new Array (17, 902, 30, 10, 200, 4, 506);
sortednums = nums.sort(numcompare);
output = sortednums.join(", ");
document.write(output);
</script>
I really don't understand how the numcompare() function works, and the book doesn't explain it very well. Any help with deciphering this piece of code? Thanks in advance. Hashim. Hi, I am trying to merge the values of 2 arrays. array 1 = 1, 2, 3, 4, 5 array 2 = a, b, c, d, e Resulting in: array 3 = 1-a, 2-b, 3-c, 4-d, 5-e etc both arrays that will be used originally will always of the same length. Both arrays will contain numbers Can you please help? Thanks Hi again folks! A code I did recently was that 10 football teams had to register and the program had to ask the question "please enter your team" ten times then show the display on screen. This code works fine and does it jobs but I realized that I did this program a long winded way (shown below) : <script type="text/javascript"> //ask to enter names var enteredteam1= prompt("Please enter first team.", ""); //each team is shown as different variable var enteredteam2= prompt("Please enter second team.", ""); var enteredteam3= prompt("Please enter third team.", ""); var enteredteam4= prompt("Please enter forth team.", ""); var enteredteam5= prompt("Please enter fifth team.", ""); var enteredteam6= prompt("Please enter sixth team.", ""); var enteredteam7= prompt("Please enter seventh team.", ""); var enteredteam8= prompt("Please enter eighth team.", ""); var enteredteam9= prompt("Please enter ninth team.", ""); var enteredteam10= prompt("Please enter final team.", ""); var team= []; team[1]= enteredteam1 //the team should equal the entered value for the space team[2]= enteredteam2 team[3]= enteredteam3 team[4]= enteredteam4 team[5]= enteredteam5 team[6]= enteredteam6 team[7]= enteredteam7 team[8]= enteredteam8 team[9]= enteredteam9 team[10]= enteredteam10 document.write("<h1>Registered Teams</h1>"); // display the teams on the screen beside number document.write("<b>1.</b>" + team[1]); //write the entered value on the screen document.write("<br><br><b>2.</b>" + team[2]); document.write("<br><br><b>3.</b>" + team[3]); document.write("<br><br><b>4.</b>" + team[4]); document.write("<br><br><b>5.</b>" + team[5]); document.write("<br><br><b>6.</b>" + team[6]); document.write("<br><br><b>7.</b>" + team[7]); document.write("<br><br><b>8.</b>" + team[8]); document.write("<br><br><b>9.</b>" + team[9]); document.write("<br><br><b>10.</b>" + team[10]); </script> I was wondering for future references could anyone suggest a simpler code to do something similar? For instance what if I wanted to ask the question but I didn't know how many teams were going to be entered. It would ask the question (enter your team) until the user clicked on a button saying "finished" or something. Once again, I am new to this field, so any code with comments would be helpful! Hi, new to this forum but have a quick question about arrays, I've been working on this all night, and I'm at a loss. I'm trying to calculate the gpa of a user by using arrays and functions. Everything seems to be working besides two things.
The array that contains the class names (className[]) always includes an extra two variables: my sentinel value which is finish, and "undefined"
The arrays at the end won't produce a number when multiplied together. creditData[] and qualityPoints[].
Also, if you have any suggestions on my code, I'd appreciate it. <script type="text/javascript"> <!-- /**************************************************************** ** PrintExplanation - prints a message containing instructions to the user without ** any variable needed. ** Inputs:None ** Outputs:None ****************************************************************/ function PrintExplanation() { alert("This program will calculate your Grade Point Average for any given semester. Please enter only graded classes, no Pass/Fail Classes."); } /**************************************************************** ** GetValidNumberInput - Error checks a number between two constraints. ** Inputs: promptString - allows the user to insert a string in order to be asked. ** lowerNum - the lower constraint you want to be compared. ** upperNum - the higher constraint you want to be compared. ** Outputs: numCredits ****************************************************************/ function GetValidNumberInput(promptString, lowerNum, upperNum) { var promptString; var lowerNum; var upperNum; var numCredits; numCredits=prompt(promptString); while(numCredits<lowerNum || numCredits>upperNum) { numCredits=prompt(promptString); } numCredits=parseFloat(numCredits) return numCredits } /**************************************************************** ** CalculateGPA - Calculates the users GPA ** Inputs: totalCredits: The total amount of credits determined by the user. ** totalQualityPoints: The total amount of quality points determined by the user. ** Outputs: gpa - the users final grade point average. ****************************************************************/ function CalculateGPA(totalCredits, totalQualityPoints) { var totalCredits; var totalQualityPoints; var gpa; gpa=totalQualityPoints/totalCredits return gpa; } function GenerateGPAReport(totalCredits, totalQualityPoints) { } /**************************************************************** ** ConvertGradeToPoints - Converts a letter given by the user into a number corresponding to grade points. ** Inputs: grade - the letter of the grade the student recieved in the course. ** Outputs: points - the number value of the grade that was input by the user. ****************************************************************/ function ConvertGradeToPoints(grade) { var grade; var points; if(grade == "A" || grade== "a") { points=4 } else if(grade == "B" || grade == "b") { points=3 } else if(grade == "C" || grade == "c") { points=2 } else if(grade == "D" || grade == "d") { points=1 } else if(grade == "F" || grade == "f") { points=0 } points=parseFloat(points); return points; } //--> </script> </head> <body> <script type="text/javascript"> var promptString; /*Declares Variables*/ var className; var numOfClasses; var grade; var semester; var numCredits; var lowerNum=1; var upperNum=4; var class1; var i=0; var counter=0; var totalCredits=0; var totalPoints=0; var grade; var counterCredits=0; var counterGrade=0; var points; var gpa; var qualityPoints; var creditData; var gradeData; var x=0; var totalQualityPoints=0; PrintExplanation(); var className = new Array(i); semester=prompt("Please enter the semester you would like to calculate your GPA for."); document.write("Grade report for " + semester + "<br />"); while(class1!="finish") /*Stores the names of the classes taken into an array*/ { class1=prompt("Enter the Class name, or finish to end"); className[i]=class1 i++ } while(counter<=i) /*writes the classes in the array from top to bottom*/ { document.write(className[counter] + "<br />"); counter++ } var creditData = new Array(i) while(counterCredits<=i) /*counts the total number of credits for all the classes*/ { numCredits=GetValidNumberInput("How many credits is " + className[counterCredits] + " class worth?",1,4) creditData[counterCredits]=numCredits totalCredits=totalCredits + numCredits counterCredits++ totalCredits=parseFloat(totalCredits); } var gradeData = new Array(i) /*collects information about grades in an array*/ while(counterGrade<i=) { points=prompt("What grade did you recieve in " + className[counterGrade] + "?"); points=ConvertGradeToPoints(points) gradeData[counterCredits]=points totalPoints=totalPoints+points counterGrade++ } while(x<=i) { qualityPoints=creditData[x]*gradeData[x] totalQualityPoints=totalQualityPoints + qualityPoints x++ } gpa=CalculateGPA(totalCredits, qualityPoints) document.write(gpa); </script> </body> This has been resolved. The moment i posted it i realised the mistake i was making . Learnig how to delete my post, until then thought i would sdimply delete the content.
I have a quick question with multiple array and random numbers. If i generate my random numbers in one array, how would i take a selection of those numbers and put them in another array? Ex: array 1: 25, 34, 38, 40, 22, 49 want to move numbers between 30 and 50 to another array. array 2: 34, 38, 40, 49 is it as simple as for loops and if statements setting the conditions? do i use a sorting method? (selection? bubble?) any help would be appreciated. I have a choice when creating a new API that I would like other peoples opinions on. Do I use a single Array or Multiple arrays such as: Code: array[1][1] = "ID[56]NAME[Hello World]START[10]"; OR Code: ID[1][1] = 56; Name[1][1] = "Hello World"; Start[1][1] = 20; The API is used for animations so is very heavy work, but would using around 15 multidimensional arrays be too much and a single one be preferable??? Thanks hi i have two arrays and i need to know which strings are in both arrays. i know how to do the bit if the string is in both but i don't know how to compare them as such. thanks |
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