I want to console.log a string but also add numbers inside of it. For example if I use the following code:
for (let i = 0; i < 5; i++) {
coinFlip = Math.round(Math.random());
if (coinFlip === 1) {
console.log("#" + i + 1 + " Heads");
} else {
console.log("#" + i + 1 + " Tails");
}
}
Since what I want to console.log starts with a string I can't seem to add numbers right after it. They become strings.
I want to get:
"#2 Tails"
But I get:
"#11 Tails"
How do I get "#2 Tails" instead of "#11 Tails"?
You need to wrap your addition in brackets.
console.log("#" + (i + 1) + " Heads");
or use string interpolation
console.log(`#${i+1} Heads`);
You can first sum up the value of i and 1 to num before the concatination
1)
for (let i = 0; i < 5; i++) {
coinFlip = Math.round(Math.random());
const num = i + 1;
if (coinFlip === 1) {
console.log("#" + num + " Heads");
} else {
console.log("#" + num + " Tails");
}
}
2)
for (let i = 0; i < 5; i++) {
coinFlip = Math.round(Math.random());
if (coinFlip === 1) {
console.log("#" + (i + 1) + " Heads");
} else {
console.log("#" + (i + 1) + " Tails");
}
}
3)
for (let i = 0; i < 5; i++) {
coinFlip = Math.round(Math.random());
if (coinFlip === 1) {
console.log(`#${i + 1} Heads`);
} else {
console.log(`#${i + 1} Tails`);
}
}
Related
I just want to create a multiplication table using Javascript but I don't want each row to have the same result. I will picture that table I want to be created for my work
In this code, the program will print 9 times
for (a = 1; a <= 9; a++) {
document.write('<div style= "float: left; margin: 25px">')
for (i = 1; i <= 9; i++) {
document.write(a + ' x ' + i + ' = ' + a * i + '</br>');
}
}
I already make a table for multiplication but I don't want to make all print 10 times. I want to make different for each table cell
I want to make like this picture and I'm new with JavaScript
var times = 1;
for (a = 9; a > 0; a--) {
for (i = 9; i > 0 && i > (9 - times); i--) {
document.write(a + ' x ' + i + ' = ' + a * i + ' ');
}
document.write('<br>');
times++;
}
You can simply add this to the second loop for (i = 1; i <= a; i++) that way you'll achieve what you want.
for (a = 1; a <= 9; a++) {
document.write('<div style= "float: left; margin: 5px">')
for (i = 1; i <= a; i++) {
document.write(a + ' x ' + i + ' = ' + a * i + '</br>');
}
}
The simple answer is replace this line for (i=1; i<=9; i++) { with this: for (i=a; i<=9; i++) {
for (a = 1; a <= 9; a++) {
document.write('<div style= "float: left; margin: 25px">')
for (i = a; i <= 9; i++) {
document.write(a + ' x ' + i + ' = ' + a * i + '</br>');
}
}
For having the exact same thing as you posted in your picture, this code do the job :
document.write("<table>");
for (a = 9; a > 0; a--) {
document.write("<tr>")
for (i = 9; i > a - 1; i--) {
document.write('<td>' + a + ' x ' + i + ' = ' + a * i + '</td>');
}
document.write('</tr>')
}
document.write("</table>")
Note the use of decrementing loop to match the order of your picture and the usage of the table
This is the code I currently have. I am having issues displaying the ordinals as I am not sure what for loop to put then in. Can someone please assist?
var bandsString = "";
var newBandString = "";
var bandsListArray = ["Linkin Park", "Atmosphere", "Rage Against The Machine", "Immortal Technique", "System of a Down"];
for (var i = 0; i < bandsListArray.length; i++) {
var currentBand = bandsListArray[i];
bandsString += "<li> My #" + [i + 1] + " band is " + currentBand + "</li>";
}
var bands = i;
if (bands == 0) {
bands = i + "st";;
} else if (bands == 1) {
bands = i + "nd";
} else if (bands == 2) {
bands = i + "rd";
} else if (bands == 3) {
bands = i + "th";
} else if (bands == 4) {
bands = i + "th";
} else {
}
for (var i = 0; i < bandsListArray.length; i++) {
var newBandList = bandsListArray[i];
newBandString += "<li>My # " + [i + 1] + " band is " + currentBand + "</li>";
}
document.write(bandsString);
document.write(newBandString);
I'm not exactly sure what you're trying to do, but does this help? Instead of manually working out how to put the correct ordinal suffix ('st', 'nd', 'rd', etc.) on the numbers, I googled a function.
The ordinal_suffix_of function works like this:
This first part is the start of the function. Hopefully this is self-explanatory. We're creating a function that accepts one parameter, that will be named i inside the function.
function ordinal_suffix_of(i) {
This next part defines j and k. You can declare multiple variables while only typing var once by using commas, as this code does:
var j = i % 10,
k = i % 100;
This would do exactly the same thing:
var j = i % 10;
var k = i % 100;
The percent sign (%) is called "modulus" and is a mathematical operator. What it does is divide the left operand by the right operand and returns the remainder. So in the case of j, it's being assigned remainder of dividing i by 10. If i was 14, for example, j would be 4. If i was 179, j would be 9. The same thing happens for k except that it's divided by 100 instead of 10.
What it's effectively doing is extracting the last 1 digit (for j) and the last 2 digits (for k) and then just checking (in the if statements) what ordinal suffixes they should have.
The reason for k is that you always want numbers ending in 1, 2, or 3 to have the suffixes st, nd , and rd except when the number ends in 11, 12, or 13, in which case it should get the suffix th. So for example, 112 should be 112th, and 313513 should be 313513th. k handles this by making it so that if the number ends in 11, 12, or 13 we only add th. Note that 11 % 100 will result in 11, so this works for 11, 12, and 13 as well.
var bandsString = "";
var newBandString = "";
var bandsListArray = ["Linkin Park", "Atmosphere", "Rage Against The Machine", "Immortal Technique", "System of a Down"];
for (var i = 0; i < bandsListArray.length; i++) {
var currentBand = bandsListArray[i];
bandsString += "<li> My #" + (i + 1) + " band is " + currentBand + "</li>";
}
for (var i = 0; i < bandsListArray.length; i++) {
var newBandList = bandsListArray[i];
newBandString += "<li>My " + ordinal_suffix_of(i + 1) + " band is " + newBandList + "</li>";
}
function ordinal_suffix_of(i) {
var j = i % 10,
k = i % 100;
if (j == 1 && k != 11) {
return i + "st";
}
if (j == 2 && k != 12) {
return i + "nd";
}
if (j == 3 && k != 13) {
return i + "rd";
}
return i + "th";
}
document.write(bandsString);
document.write(newBandString);
Try this, just make the code more simple
var bandsString = "";
var newBandString = "";
var bandsListArray = ["Linkin Park", "Atmosphere", "Rage Against The Machine", "Immortal Technique", "System of a Down"];
for (var i = 0; i < bandsListArray.length; i++) {
var currentBand = bandsListArray[i];
bandsString += "<li> My #" + [i + 1] + " band is " + currentBand + "</li>";
newBandString += "<li> My #" + numeric(i+1) + " band is " + currentBand + "</li>";
}
function numeric(i){
var bands = i+"th";
if (i == 1) {
bands = i + "st";;
} else if (i == 2) {
bands = i + "nd";
} else if (i == 3) {
bands = i + "rd";
}
return bands;
}
document.write(bandsString);
document.write(newBandString);
If this is what you are trying to achieve is:
My 2nd band is Atmosphere
Then this how you might achieve it
var bandsString = "";
var newBandString = "";
var bandsListArray = ["Linkin Park", "Atmosphere", "Rage Against The Machine", "Immortal Technique", "System of a Down"];
for (var i = 0; i < bandsListArray.length; i++) {
var currentBand = bandsListArray[i];
bandsString += "<li> My #" + (i + 1) + " band is " + currentBand + "</li>";
newBandString += "<li>My " + numberSuffix(i + 1) + " band is " + currentBand + "</li>";
}
function numberSuffix(number){
if(number % 10==1) return number+'st';
if(number % 10==2) return number+'nd';
if(number % 10==3) return number+'rd';
return number+'th';
}
document.write(bandsString);
document.write(newBandString);
I am trying to add all values of class tmpcpa and place result in final_cpa but final_cpa always return 0.
document.getElementById('cpa' + arr[0]).innerHTML = cpa + '(' + '<label id="tmpcpa">' + tmp_cpa + "</label>" +' For Final' + ')';
var final_cpa = calculate_final_cpa();
console.log(final_cpa);
function calculate_final_cpa() {
var final_cpa = 0;
$('.tmpcpa').each(function () {
if ($(this).val() != 0)
final_cpa += parseInt($(this).text()) || 0;
});
return final_cpa;
}
Surprisingly when i view source code in browser HTML appears as
<label class="tmpcpa">0</label> but when i do inspect element it shows as
<label class="tmpcpa">30.0</label>
Update here is the whole JS. HTML calls process function which ultimately calls calculate_final_cpa()
//"use strict";
function process(arr) {
document.getElementById('txtgrade' + arr[0] + arr[1] + arr[2]).innerHTML = show_grade(document.getElementById('txtpercentage' + arr[0] + arr[1] + arr[2]).value);
if (validateForm(arr)) {
var module_percentage = +document.getElementById('txtpercentage' + arr[0] + arr[1] + arr[2]).value;
var module_credit = +document.getElementById('txtcredit' + arr[0] + arr[1] + arr[2]).innerHTML;
if (!isNaN(module_percentage) || !isNaN(module_credit)) {
module_percentage = 0;
module_credit = 0;
var total_credit_semester = 0;
var sum_module_percentage_x_credit = 0;
for ( i= 2 ; i <= arr[3] + 1 ; i++) {
module_percentage = +document.getElementById('txtpercentage' + arr[0] + arr[1] + i).value;
module_credit = +document.getElementById('txtcredit' + arr[0] + arr[1] + i).innerHTML;
sum_module_percentage_x_credit += module_percentage * module_credit;
total_credit_semester += module_credit;
}
//console.log(module_percentage);
var spa = sum_module_percentage_x_credit / total_credit_semester;
spa = spa.toFixed(1);
document.getElementById('spa' + arr[0] + arr[1]).innerHTML = spa;
calculate_cpa(arr);
}
}
}
function validateForm(arr) {
var isValid = true;
var tbl_id = 'tbl_semester' + arr[0] + arr[1];
$('#' + tbl_id + ' :input').each(function () {
if ($(this).val() === '')
isValid = false;
});
return isValid;
}
function calculate_final_cpa() {
var final_cpa = 0;
$('.tmpcpa').each(function () {
if ($(this).val() != 0)
final_cpa += parseInt($(this).text()) || 0;
});
return final_cpa;
}
/*
* Works for 2 semester per level and 3 year course (optimize later)
*/
function calculate_cpa(arr) {
var isValid = true;
for ( i= 1 ; i <= 2 ; i++) {
var spa = document.getElementById('spa' + arr[0] + i).innerHTML;
if (spa == "N/A") {
isValid = false;
}
}
if (isValid) {
var total_credit_level = 0;
var total_spa_x_credit = 0;
for ( i= 1 ; i <= 2 ; i++) {
var arr2= [arr[0], i];
var spa = +document.getElementById('spa' + arr[0] + i).innerHTML;
total_spa_x_credit += spa * getcredits(arr2);
total_credit_level += getcredits(arr2);
}
var cpa = total_spa_x_credit / total_credit_level;
cpa = cpa.toFixed(1);
document.getElementById('cpa' + arr[0]).innerHTML = cpa;
var level = +document.getElementById('level' + arr[0]).innerHTML
var tmp_cpa = ((level / 100) * cpa).toFixed(1);
document.getElementById('cpa' + arr[0]).innerHTML = cpa + '(' + '<label class="tmpcpa">' + tmp_cpa + "</label>" +' For Final' + ')';
var final_cpa = calculate_final_cpa();
console.log(final_cpa);
if (final_cpa != 0) {
var award = show_award(final_cpa);
document.getElementById('award').innerHTML = award;
document.getElementById('finalcpa').innerHTML = final_cpa;
}
}
}
function getcredits(arr) {
var sum = 0;
var tbl_id = 'tbl_semester' + arr[0] + arr[1];
$('#' + tbl_id + ' .sum').each(function () {
sum += parseInt($(this).text())||0;
});
return sum;
}
function show_grade(module_percentage) {
if (isNaN(module_percentage)) {
return 'N/A';
}
if (module_percentage >= 70 && module_percentage <= 100) {
return 'A';
} else if (module_percentage >= 60 && module_percentage < 70) {
return 'B';
} else if (module_percentage >= 50 && module_percentage < 60) {
return 'C';
} else if (module_percentage >= 40 && module_percentage < 50) {
return 'D';
} else {
return 'F';
}
}
function show_award(cpa) {
if (isNaN(cpa)) {
return 'N/A';
}
if (cpa >= 70 && cpa <= 100) {
return 'First Class with Honours';
} else if (cpa >= 60 && cpa < 70) {
return 'Second Class First Division with Honours';
} else if (cpa >= 50 && cpa < 60) {
return 'Second Class Second Division with Honours';
} else if (cpa >= 45 && cpa < 50) {
return 'Third Class with Honours';
} else if (cpa >= 40 && cpa < 45) {
return 'Pass';
} else if (cpa < 40) {
return 'No award';
}
}
you need to be sure you are calling the function after the document is ready.
Also, you are using unassigned value.
</body>
<script>
function calculate_final_cpa() {
var final_cpa = 0;
$('.tmpcpa').each(function () {
if ($(this).val() != 0)
final_cpa += parseInt($(this).text()) || 0;
});
return final_cpa;
}
$(document).ready(function(){
var final_cpa = calculate_final_cpa();
document.getElementById('cpa' + arr[0]).innerHTML = cpa + '(' + '<label id="tmpcpa">' + final_cpa + "</label>" +' For Final' + ')';
console.log(final_cpa);
});
</script>
How to create dynamic variable and sum values again to assign the dynamic variable?
For Example,
var incomeCr = 0, incomeDr = 0;
for (var j = 1; j <= noOfMonths; j++)
{
if(response[i]["AmountType" + j] == "Cr")
{
if(response[i]["ClosingBalanceWithType" + j] < 0)
{
response[i]["ClosingBalanceWithType" + j] = -1 * response[i]["ClosingBalanceWithType" + j];
}
incomeCr += parseFloat(response[i]["ClosingBalanceWithType" + j]);
}
else if (response[i]["AmountType" + j] == "Dr")
{
if (response[i]["ClosingBalanceWithType" + j] < 0)
{
response[i]["ClosingBalanceWithType" + j] = -1 * response[i]["ClosingBalanceWithType" + j];
}
incomeDr += parseFloat(response[i]["ClosingBalanceWithType" + j]);
}
}
Here how to create dynamic variable incomeCr1, incomeCr2... and incomeDr1, incomeDr2... and sum the values again assign values to dynamic variable.
You can not create dynamic variables like that. Instead use an array:
var incomeCr = [];
//incomeCr[1], incomeCr[2],...
incomeCr[1] = "txt";
incomeCr[2] = "txt2";
var incomeCr = 0, incomeDr = 0, expenseCr = 0, expenseDr = 0, iIncomeCr = {}, eExpenseCr = {}, iIncomeDr = {}, eExpenseDr = {}, cr = [];
for (var i = 0; i < response.length; i++) {
// Sum Primary Group Income on each Month
if (response[i].Type == "Ledger" && response[i].PrimaryGroup == "Incomes") {
for (var j = 1; j <= noOfMonths; j++) {
if (response[i]["AmountType" + j] == "Cr") {
if (response[i]["ClosingBalanceWithType" + j] < 0) {
response[i]["ClosingBalanceWithType" + j] = -1 * response[i]["ClosingBalanceWithType" + j];
}
iIncomeCr["incomeCr" + j] = (iIncomeCr["incomeCr" + j] ? iIncomeCr["incomeCr" + j] : 0) + parseFloat(response[i]["ClosingBalanceWithType" + j]);
iIncomeDr["incomeDr" + j] = iIncomeDr["incomeDr" + j] ? iIncomeDr["incomeDr" + j] : 0;
} else if (response[i]["AmountType" + j] == "Dr") {
if (response[i]["ClosingBalanceWithType" + j] < 0) {
response[i]["ClosingBalanceWithType" + j] = -1 * response[i]["ClosingBalanceWithType" + j];
}
iIncomeDr["incomeDr" + j] = (iIncomeDr["incomeDr" + j] ? iIncomeDr["incomeDr" + j] : 0) + parseFloat(response[i]["ClosingBalanceWithType" + j]);
iIncomeCr["incomeCr" + j] = iIncomeCr["incomeCr" + j] ? iIncomeCr["incomeCr" + j] : 0;
}
}
}
To preface this, we are a small organization and this system was built by someone long ago. I am a total novice at javascript so I have trouble doing complicated things, but I will do my best to understand your answers. But unfortunately redoing everything from scratch is not really an option at this point.
We have a system of collecting data where clients use a login to verify a member ID, which the system then uses to pull records from an MS Access database to .ASP/html forms so clients can update their data. One of these pages has the following function that runs on form submit to check that data in fields a/b/c sum to the same total as d/e/f/g/h/i. It does this separately for each column displayed (each column is a record in the database, each a/b/c/d/e/f is a field in the record.)
The problem is with this section of the function:
for (var j=0; j<recCnt; j++) {
sumByType = milesSurf[j] + milesElev[j] + milesUnder[j];
sumByTrack = milesSingle[j] + milesDouble[j] + milesTriple[j] + milesQuad[j] + milesPent[j] + milesSex[j];
etc.
It should use javascript FOR to loop through each record and test to see if they sum to the same thing.
In Firefox and IE this is working properly; the fields sum properly into "sumByType" and "sumByTrack". You can see below I added a little alert to figure out what was going wrong:
alert(sumByType + " " + j + " " + recCnt + " " + milesSurf[j] + " " + milesElev[j] + " " + milesUnder[j]);
In Chrome, that alert tells me that the components of "sumByType" and "sumByTrack" (the various "milesXXXXX" variables) are undefined.
My question is: Why in Chrome is this not working properly, when in IE and FFox it is? Any ideas?
Full function code below:
function submitCheck(formy, recCnt) {
//2/10/03: added milesQuad
//---------------checks Q#4 that Line Mileage by type is the same as by track
var milesElev = new Array();
var milesSurf = new Array();
var milesUnder = new Array();
var milesSingle = new Array();
var milesDouble = new Array();
var milesTriple = new Array();
var milesQuad = new Array();
var milesPent = new Array();
var milesSex = new Array();
var sumByType = 0;
var milesLineTrack = new Array(); //this is for Q5 to compare it to mileage by trackage
var j = 0; var sumByTrack = 0; var liney; var yrOp;
//var str = "document.frm.milesElev" + j;
//alert(str.value);
for (var i in document.frm) {
if (i.substring(0, i.length - 1) == "milesElev") {
milesElev[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesSurf") {
milesSurf[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesUnder") {
milesUnder[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesSingle") {
milesSingle[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesDouble") {
milesDouble[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesTriple") {
milesTriple[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesQuad") {
milesQuad[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesPent") {
milesPent[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length - 1) == "milesSex") {
milesSex[parseInt(i.substring(i.length-1, i.length))] = parseFloat(document.frm[i].value); }
if (i.substring(0, i.length -1) == "milesLineTrack") {
milesLineTrack[parseInt(i.substring(i.length-1, i.length))] = document.frm[i].value; } //12/13/02 used to be parseFloat(document.frm[i].value)
if (i.substring(0,5)=="Lines") {
liney = document.frm[i].value;
if (parseInt(liney)<1 || isNaN(liney)) {
alert("Each mode must have at least 1 line. Please correct the value in question #2.");
document.frm[i].select(); return false; }}
if (i.substring(0,8)=="yearOpen") {
yrOp = document.frm[i].value;
if (parseInt(yrOp)<1825 || isNaN(yrOp)) {
alert("Please enter a year after 1825 for question #3");
document.frm[i].select(); return false; }
}
}
for (var j=0; j<recCnt; j++) {
sumByType = milesSurf[j] + milesElev[j] + milesUnder[j];
sumByTrack = milesSingle[j] + milesDouble[j] + milesTriple[j] + milesQuad[j] + milesPent[j] + milesSex[j];
//---------------to round sumByTrack and sumByType from a long decimal to a single decimal place, like frm 7.89999998 to 7.9.
sumByTrack = sumByTrack * 10;
if (sumByTrack != parseInt(sumByTrack)) {
if (sumByTrack - parseInt(sumByTrack) >= .5) {
//round up
sumByTrack = parseInt(sumByTrack) + 1; }
else { //truncate
sumByTrack = parseInt(sumByTrack); }}
sumByTrack = sumByTrack / 10;
sumByType = sumByType * 10;
if (sumByType != parseInt(sumByType)) {
if (sumByType - parseInt(sumByType) >= .5) {
//round up
sumByType = parseInt(sumByType) + 1; }
else { //truncate
sumByType = parseInt(sumByType); }}
sumByType = sumByType / 10;
//-------------end of rounding ---------------------------
if (sumByType != sumByTrack) {
if (isNaN(sumByType)) {
sumByType = "(sum of 4.a., b., and c.) "; }
else {
sumByType = "of " + sumByType; }
if (isNaN(sumByTrack)) {
sumByTrack = "(sum of 4.d., e., f., g., h., and i.) "; }
else {
sumByTrack = "of " + sumByTrack; }
alert("For #4, the 'End-to-End Mileage By Type' " + sumByType + " must equal the 'End-to-end Mileage By Trackage' " + sumByTrack + ".");
alert(sumByType + " " + j + " " + recCnt + " " + milesSurf[j] + " " + milesElev[j] + " " + milesUnder[j]);
return false;
}
//alert (milesLineTrack[j] + " " + milesSingle[j] + " " + 2*milesDouble[j] + " " + 3*milesTriple[j] + " " + 4*milesQuad[j] + " " + 5*milesPent[j] + " " + 6*milesSex[j]);
var singDoubTrip = (milesSingle[j] + 2*milesDouble[j] + 3*milesTriple[j] + 4*milesQuad[j] + 5*milesPent[j] + 6*milesSex[j])
//----------round singDoubTrip to one digit after the decimal point (like from 6.000000001 to 6.0)
singDoubTrip = singDoubTrip * 10;
if (singDoubTrip != parseInt(singDoubTrip)) {
if (singDoubTrip - parseInt(singDoubTrip) >= .5) {
//round up
singDoubTrip = parseInt(singDoubTrip) + 1; }
else { //truncate
singDoubTrip = parseInt(singDoubTrip); }}
singDoubTrip = singDoubTrip / 10;
//----------end round singDoubTrip-----------------------------------------
if (parseFloat(milesLineTrack[j]) != singDoubTrip) {
//var mlt = milesLineTrack[j];
//if isNaN(milesLineTrack[j]) { mlt =
alert("For column #" + (j+1) + ", the mainline passenger track mileage of " + milesLineTrack[j] + " must equal the single track plus 2 times the double track plus 3 times the triple track plus 4 times the quadruple track plus 5 times the quintuple track plus 6 times the sextuple track, which is " + singDoubTrip + ".");
return false;
}
}
//---------------------end of checking Q#4----------------
//return false;
}
I think for (var i in document.frm) is the problem. You should not enumerate a form element, there will be plenty of unexpected properties - see Why is using "for...in" with array iteration a bad idea?, which is especially true for array-like objects. I can't believe this works properly in FF :-)
Use this:
var ele = document.frm.elements; // or even better document.getElementById("frm")
for (var i=0; i<ele.length; i++) {
// use ele[i] to access the element,
// and ele[i].name instead of i where you need the name
}
Also, you should favour a loop over those gazillion of if-statements.