Category: JavaScript Answers

Sometimes, we want to do list comprehensions like Python with JavaScript.

In this article, we’ll look at how to do list comprehensions like Python with JavaScript.

How to do list comprehensions like Python with JavaScript?

To do list comprehensions like Python with JavaScript, we can use the array filter method.

For instance, we write

const string = "1234-5";
const forbidden = "-";

console.log(
  [...string].filter((c) => !forbidden.includes(c)).map((c) => parseInt(c))
);

to call filter with an array with the characters in string to return a new array with the characters that aren’t in the forbidden string.

We call map with a callback to convert each value to an int with parseInt.

Conclusion

To do list comprehensions like Python with JavaScript, we can use the array filter method.

Sometimes, we want to convert int to float with JavaScript.

In this article, we’ll look at how to convert int to float with JavaScript.

How to convert int to float with JavaScript?

To convert int to float with JavaScript, we can use the toFixed method.

For instance, we write

const n = (4).toFixed(2);

to call toFixed with 2 to return 4 as a string rounded to 2 decimal places.

Conclusion

To convert int to float with JavaScript, we can use the toFixed method.

Sometimes, we want to fix Uncaught TypeError: data.push is not a function with JavaScript.

In this article, we’ll look at how to fix Uncaught TypeError: data.push is not a function with JavaScript.

How to fix Uncaught TypeError: data.push is not a function with JavaScript?

To fix Uncaught TypeError: data.push is not a function with JavaScript, we should make sure data is an array.

For instance, we write

const data = [
  {
    name: "ananta",
    age: "15",
    country: "Atlanta",
  },
];

data.push({ name: "Tony Montana", age: "99" });
data.push({ country: "IN" });

to declare the data array.

And then we call data.push to append new entries into data.

Conclusion

To fix Uncaught TypeError: data.push is not a function with JavaScript, we should make sure data is an array.

Sometimes, we want to fix the "Received: serializes to the same string" error with Jest and JavaScript.

In this article, we’ll look at how to fix the "Received: serializes to the same string" error with Jest and JavaScript.

How to fix the "Received: serializes to the same string" error with Jest and JavaScript?

To fix the "Received: serializes to the same string" error with Jest and JavaScript, we can use the toStrictEqual method.

For instance, we write

expect(array).toStrictEqual(["more than one", "more than one"]);

to check if array is exactly the same as ["more than one", "more than one"] by using a deep equality check.

Conclusion

To fix the "Received: serializes to the same string" error with Jest and JavaScript, we can use the toStrictEqual method.

Sometimes, we want to do string and number conversion with JavaScript.

In this article, we’ll look at how to do string and number conversion with JavaScript.

How to do string and number conversion with JavaScript?

To do string and number conversion with JavaScript, we can use the parseInt function.

For instance, we write

const n = parseInt("123");

to parse string '123' into a number with parseInt.

Conclusion

To do string and number conversion with JavaScript, we can use the parseInt function.