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function getNucleobaseCount (strand) {
/*
Returns occurences of nucleobases A and C respectively
*/
var countA = (strand.split("A").lenght - 1);
var countC = (strand.split("C").lenght - 1);
return countA + " " + countC;
}
But
> console.log(getNucleobaseCount("AAGCATT"))
Nan Nan
Instead of the expected 3 1
Why?
The value of the lenght property will be undefined.
undefined - 1 is NaN
You misspelt length.
Misspelling of length? I would think that it would show a compilation error though.
you have
misspelled 'length' :-)
function getNucleobaseCount (strand) {
/*
Returns occurences of nucleobases A and C respectively
*/
var countA = (strand.split("A").length - 1);
var countC = (strand.split("C").length - 1);
return countA + " " + countC;
}
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I have a program that counts the number of lines in a text file and it works fine. What I am trying to do is count the number of lines in 2 different files and calculate their difference but I'm getting NaN I parsed them to integers why is it not a number? How can I calculate their difference? Thanks in advance.
filePath = process.argv[2];
fileBuffer = fs.readFileSync('filePath');
to_string = fileBuffer.toString();
split_lines = to_string.split("\n");
filePath2 = process.argv[2];
fileBuffer2 = fs.readFileSync('filePath2');
to_string2 = fileBuffer2.toString();
split_lines2 = to_string2.split("\n");
//logging NaN
console.log("Calc :" + parseInt(split_lines2.length) - parseInt(split_lines.length))
Lets take a close look at this line
console.log("Calc :" + parseInt(split_lines2.length) - parseInt(split_lines.length))
Since I don't have those var's, lets replace them with some demo numbers:
console.log("Calc :" + 10 - 5);
This will still return NaN because "Calc :10" - 5 fails.
If you enclose the sum in some brackets, there evaluated before adding to the string so it becomes "Calc :" + 5. Since JS will convert the 5 to a string, it producing the expected output:
console.log("Calc :" + (10 - 5));
So you're console.log should look something like:
console.log("Calc :" + (parseInt(split_lines2.length) - parseInt(split_lines.length)))
Because you do math together with "Calc :":
"Calc :" plus split_lines2.length, minus split_lines.length - no concatenation here.
Wrap calculations inside (), so your + becomes concatenation instead of addition
/* filePath = process.argv[2];
fileBuffer = fs.readFileSync('filePath');
to_string = fileBuffer.toString();
split_lines = to_string.split("\n");
filePath2 = process.argv[2];
fileBuffer2 = fs.readFileSync('filePath2');
to_string2 = fileBuffer2.toString();
split_lines2 = to_string2.split("\n"); */
var split_lines2 = [1, 2];
var split_lines = [1]
//logging NaN
console.log("Calc :" + (parseInt(split_lines2.length) - parseInt(split_lines.length)))
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I have an assignment to make calculator using vue.js.
Much of it works, I'm confused about how to implement the '=' function.
I found this piece of code in an article that does something similar but I don't understand what it does. Can someone explain it?
https://scotch.io/tutorials/build-a-scientific-calculator-with-vuejs
I found this Piece of code:
if ((app.current).indexOf("^") > -1) {
var base = (app.current).slice(0, (app.current).indexOf("^"));
var exponent = (app.current).slice((app.current).indexOf("^") + 1);
app.current = eval("Math.pow(" + base + "," + exponent + ")");
} else {
app.current =app.current
}
Can someone please explain what the above function does, line-by-line?
// checks if app.current have '^' by getting the index
// if the method indexOf doesn't find anything it return -1
if (app.current.indexOf('^') > -1) {
// gets the first element till the index where it found '^'
var base = app.current.slice(0, app.current.indexOf('^'));
// gets the number after the 'ˆ'
var exponent = app.current.slice(app.current.indexOf('^') + 1);
// eval is evil
// it gets the string and transfoms into valid code
// wich means to do the operation
app.current = eval('Math.pow(' + base + ',' + exponent + ')');
} else {
// if it doesn't find the index it keeps the same value
app.current = app.current;
}
https://javascriptweblog.wordpress.com/2010/04/19/how-evil-is-eval/
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I've looked this code over and over.. I typed it as I was learning from lesson material, and have checked and checked over and over again. the code works for the instructor, but not me. Is it my mistake or is it a problem for the platform I am using? It not working may seems trivial comparing to needing to understand what is being taught, but I still would like to understand all that I can. thank you. https://codepen.io/Slimmwillis/pen/EQWpGP?editors=1111
function yearsUntilRetirement(name, year) {
var age = calculateAge(year);
var retirement = 65 - age;
if (retirement >= 0) {
console.log(name + ' retires in ' + retirement + ' years.');
} else {
console.log(name + ' is already retired.');
}
}
yearsUntilRetirment('John', 1990);
you need to be very careful while typing. You're not calling the right function so nothing happens.
function yearsUntilRetirement(name, year) {
var age = calculateAge(year);
console.log('hello');
var retirement = 65 - age;
if (retirement >= 0) {
console.log(name + " retires in " + retirement + " years.");
} else {
console.log(name + " is already retired.");
}
}
yearsUntilRetirment("John", 1990);
Check the yearsUntilRetirment("John", 1990); ! the name doesn't match the function.
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It says I have a Missing ; before statement on the "var api =..." line.
I'm not sure what else it is I need to do.
If you need to see the rest of the script, please let me know. I will gladly submit everything else.
function askWolframAlpha_(q, app) {
try {
var api = "http://api.wolframalpha.com/v2/query?podindex=2&format=plaintext&appid=" + 67ULAK-L9R928PL76 + "&input=" + encodeURIComponent(q);
var response = UrlFetchApp.fetch(api, {
muteHttpException: true
});
// Parse the XML response
if (response.getResponseCode() == 200) {
var document = XmlService.parse(response.getContentText());
var root = document.getRootElement();
if (root.getAttribute("success").getValue() === "true") {
return root.getChild("pod").getChild("subpod").getChild("plaintext").getText();
}
}
} catch (f) {}
return false;
}
The problem is the 67ULAK-L9R928PL76 in the following line:
var api = "http://api.wolframalpha.com/v2/query?podindex=2&format=plaintext&appid=" + 67ULAK-L9R928PL76 + "&input=" + encodeURIComponent(q);
Change to:
var api = "http://api.wolframalpha.com/v2/query?podindex=2&format=plaintext&appid=67ULAK-L9R928PL76&input=" + encodeURIComponent(q);
or at least to:
var api = "http://api.wolframalpha.com/v2/query?podindex=2&format=plaintext&appid=" + "67ULAK-L9R928PL76" + "&input=" + encodeURIComponent(q);
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Closed 9 years ago.
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Hello I am getting error "elements is undefined" in Javascript
function ImportExcelMapping()
{
debugger;
var str = "";
for (var i = 0; i < document.forms[0].elements.length; i++ ) {
if (document.forms[0].elements[i].type == "hidden") {
str += '<input type=\"hidden\" name="' + elements[i].name + '" value=\"' + elements[i].value + '">';
}
}
// rest of function
}
please help
elements[i].name
Where is elements defined? Is that supposed to be document.forms[0].elements[i]?
EDIT:
Since you seem to be confused still, I'll add a bit more detail. Hopefully this clears it up.
You either need to declare elements at the top of your function, like so:
function ImportExcelMapping() {
debugger;
var str = "";
var elements = document.forms[0].elements;
// rest of function
}
Or
You need to change the line that's breaking to this:
str += '<input type=\"hidden\" name="' + document.forms[0].element[i].name + '" value=\"' + document.forms[0].element[i].value + '">';
Well you never defined elements. You probably just need to declare it:
var elements = document.forms[0].elements[i];