Push a random character from an array into another array [closed] - javascript

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var legalCharactersForSaveCode = ["B","C","D","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z", "+", "/",];
var saveCode = [];
function generateSaveCode() {
for(var c = 0; c > 30; c++){
v = Math.round(Math.random() * legalCharactersForSaveCode.length);
saveCode.push(legalCharactersForSaveCode[v]);
}
saveCode.push(store.get("money"));
alert(saveCode);
}
I'm trying to make it so it pushes a random character.
When I ask it to alert the saveCode array all it does is alert the money.
(I'm using store.js)
I was expecting for it to push a random characters from the legalCharacters array into the saveCode array.

Your "for" loop does not work as the condition is c > 30, and should be c < 30

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Why is my answer in the compiler not the same, with the answer from leetcode compiler? [closed]

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Closed 1 year ago.
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I have a simple code, its essence is to remove duplicate numbers from a sheet. But on my server, the data received does not match the data on leetcode. For what reason could this be?
var deleteDuplicates = (head) => {
for(let i = 0; i < head.length; i++) {
for(let a = i + 1; a < head.length; a++) {
if(head[i] === head[a] ) {
head.splice([a], 1)
}
}
}
return head;
};
console.log(deleteDuplicates([1,1,2]));
Output: [1,2]
Leetcode:
Your input
[1,1,2]
Output
[1,1,2]
Expected
[1,2]
How about using a Set? It's simpler and you'll avoid modifying a list that you're iterating over.
var deleteDuplicates = (head) => [...new Set(head)];

Number prediction from 1 to 10 from javascript [closed]

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Closed 1 year ago.
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This is my code but when i run this code in console always giving me Congratulations.
Help me for solve this problem.
var val=Math.floor(Math.random() * 10) + 1;
console.log(val);
var Predict = Number(prompt("Prediction ?"));
for(var i=1 ; i <= 3; i++){
if(Predict<val){console.log("Up")};
if(Predict=val){console.log("Congratulations") };
if(Predict>val){console.log("Down")}
}
Equal operator assigns the right hand to the left hand and so the result is always true! To compare two values use double equals like this:
if (Predict==val){console.log("Congratulations") };

Why doesn't variable update in for loop JavaScript? [closed]

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Closed 2 years ago.
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I am doing a coding challenge where the letters in a string are replaced by their partner letters, I know that there is probably a better way to do this, but I just want to know why this doesn't work. Here is the code:
function DNAStrand(dna){
var strObject = {"A":"T", "T":"A", "C":"G", "G":"C"};
let newDna = "";
for (let i=0; i < dna.lenght; i++){
newDna += strObject[dna[i]];
}
return newDna
}
the function returns an empty string or "", the value of newDna before the loop, it doesn't change.
for (let i=0; i < dna.lenght; i++){
You made a typo. Change this to dna.length.

Issues with displaying certain array elements with a conditional in javascript [closed]

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 2 years ago.
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I'm trying to use a for loop to display all the elements in my array that are greater than 5. I am using an if-statement to determine the values greater than five, but when I run the code, I get values printed to the console that are both below and over five. I have tried creating variables to store the index values and tried using the && operator, but none of these have worked.
Here is the code for reference:
var myArray = [];
appendItem(myArray, randomNumber(1,10));
appendItem(myArray, randomNumber(1,10));
appendItem(myArray, randomNumber(1,10));
console.log("Original: " + myArray);
console.log("Values greater than 5");
// the part I have issues with
for (var i = 0; i < myArray.length; i++) {
if (myArray[i] > 5) {
console.log(i);
}
}
You are printing i not the array element.
try
console.log(myArray[i]);

Attempting to use a 'for' loop to build an Array [closed]

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This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 6 years ago.
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I am attempting to build an array whose entries are the letters of any given word. I though I had written a clever bit of code, but it doesn't work in the slightest! And feedback or help would be greatly appreciated:
var inputWord = prompt("PALINDROME CHECKER:");
var numberOfLetters = inputWord.length;
var letters = [];
for(i=0; i++; i<numberOfLetters){
letters[i] = inputWord.substring(i,i+1);
};
Thanks,
CPR
If you want an array with the letters of a string, just split the string with no pattern:
var string = "My string is this";
var array = string.split("");
console.log(array);
Your for loop is wrong. Try:
var inputWord = prompt("PALINDROME CHECKER:");
var numberOfLetters = inputWord.length;
var letters = [];
for(i=0; i<numberOfLetters; i++){
letters[i] = inputWord.substring(i,i+1);
};
The order of the for loop parameters should be iterator, then condition, then action - basically, "for my variable i, if i is less than the number of letters, then increment i"

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