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quick sort

Nov 19, 2022CodeCatch
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More JavaScript Posts

drag and drop uploader

Nov 18, 2022AustinLeath

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const dragAndDropDiv = editor.container;
dragAndDropDiv.addEventListener('dragover', function(e) {
e.stopPropagation();
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
});
dragAndDropDiv.addEventListener("drop",function(e){
// Prevent default behavior (Prevent file from being opened)
e.stopPropagation();
e.preventDefault();
const files = e.dataTransfer.items; // Array of all files
console.assert(files.length >= 1);
if (files[0].kind === 'file') {
var file = e.dataTransfer.items[0].getAsFile();
const fileSize = file.size;
const fileName = file.name;
const fileMimeType = file.type;
reader = new FileReader();
reader.onloadend = function(){
editor.setValue(reader.result);
}
reader.readAsText(file);
}else{
//Maybe handle if text is dropped
console.log(files[0].kind);
}
});

containsDuplicate

Nov 19, 2022CodeCatch

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let nums = [1,2,3,1]
var containsDuplicate = function(nums) {
let obj = {};
for(let i =0; i< nums.length; i++){
if(obj[nums[i]]){
obj[nums[i]] += 1;
return true;
}else{
obj[nums[i]] = 1;
}
}
return false;
};
console.log(containsDuplicate(nums));

power set

Nov 19, 2022CodeCatch

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const powerset = arr =>
arr.reduce((a, v) => a.concat(a.map(r => r.concat(v))), [[]]);
powerset([1, 2]); // [[], [1], [2], [1, 2]]

find primes

Nov 19, 2022CodeCatch

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const primes = num => {
let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),
sqroot = Math.floor(Math.sqrt(num)),
numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);
numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y === x)));
return arr;
};
primes(10); // [2, 3, 5, 7]

Mongoose DB Connection

Mar 11, 2021C S

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require("dotenv").config();
const mongoose = require("mongoose");
const db = process.env.MONGO_URI;
const connectDB = async () => {
try {
await mongoose.connect(db, {
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false,
useCreateIndex: true
});
console.log("MongoDB Connected");
} catch (err) {
console.error(err.message);
}
};
module.exports = connectDB;

JS Test

Mar 9, 2021LeifMessinger

0 likes • 1 view

alert("bruh")