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count substrings

Nov 19, 2022CodeCatch
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More JavaScript Posts

Clone an array

Nov 19, 2022CodeCatch

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// `arr` is an array
const clone = arr => arr.slice(0);
// Or
const clone = arr => [...arr];
// Or
const clone = arr => Array.from(arr);
// Or
const clone = arr => arr.map(x => x);
// Or
const clone = arr => JSON.parse(JSON.stringify(arr));
// Or
const clone = arr => arr.concat([]);

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;

Convert data to yyyy mm dd format

Nov 19, 2022CodeCatch

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// `date` is a `Date` object
const formatYmd = date => date.toISOString().slice(0, 10);
// Example
formatYmd(new Date()); // 2020-05-06

getSelectedText

Nov 18, 2022AustinLeath

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// Get the text that the user has selected
const getSelectedText = () => window.getSelection().toString();
getSelectedText();

greatest common denominator

Nov 19, 2022CodeCatch

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const gcd = (...arr) => {
const _gcd = (x, y) => (!y ? x : gcd(y, x % y));
return [...arr].reduce((a, b) => _gcd(a, b));
};
gcd(8, 36); // 4
gcd(...[12, 8, 32]); // 4

Date Time Testing

Nov 18, 2022AustinLeath

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var d = new Date();
var d = new Date(milliseconds);
var d = new Date(dateString);
var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);