To redirect a POST request with Node.js Express, we call redirect to redirect.
For instance, we write
app.post("/", (req, res) => {
res.redirect(301, "/test");
});
to call redirect with the status code and the URL of the direct to do the redirect.
To get error status code with Node http get, we can listen for the error event.
For instance, we write
const https = require("https");
const request = https.get("https://example.com", (response) => {
console.log(response.statusCode);
});
request.on("error", (error) => {
console.error(error.status);
});
to call get to make a request to https://example.com.
We get the statusCode for a normal response with response.statusCode in the callback.
If there’s an error, then the error event callback is called and we get the status from error.status.
We listen for the error event with request.on`.
To create a zero filled JavaScript array, we use the fill method.
For instance, we write
const arr = Array(10).fill(0);
to call Array with 10 to create an array with 10 empty slots.
Then we call fill with 0 to fill all the empty slots with 0.
To initialize an array’s length in JavaScript, we set the array’s length property.
For instance, we write
const test = [];
test.length = 4;
to set the length property of the test array to set its length to 4.
To split array into chunks with JavaScript, we use a for loop.
For instance, we write
const chunkSize = 10;
for (let i = 0; i < array.length; i += chunkSize) {
const chunk = array.slice(i, i + chunkSize);
//...
}
to use a for loop to loop through i from 0 to the array‘s length minus 1.
We increment i by the chunkSize in each iteration.
In the loop, we call array.slice with i and i + chunkSize to return the slice of the array between index i and i + chunkSize - 1 as a new array.