Author: John Au-Yeung

Sometimes, we want to increment or decrement for loop by more than one with JavaScript.

In this article, we’ll look at how to increment or decrement for loop by more than one with JavaScript.

How to increment or decrement for loop by more than one with JavaScript?

To increment or decrement for loop by more than one with JavaScript, we can increment with += or decrement with -=.

For instance, we write

for (let i = 0; i < myVar.length; i += 3) {
  //...
}

to increment i by 3 with i += 3.

Or we write

for (let i = myVar.length - 1; i >= 0; i -= 3) {
  //...
}

to decrement i by 3 with i -= 3.

Conclusion

To increment or decrement for loop by more than one with JavaScript, we can increment with += or decrement with -=.

Sometimes, we want to check if a value exists in an object using JavaScript.

In this article, we’ll look at how to check if a value exists in an object using JavaScript.

How to check if a value exists in an object using JavaScript?

To check if a value exists in an object using JavaScript, we use the Object.values and the array includes method.

For instance, we write

const exists = Object.values(obj).includes("test1");

to get an array of property values in object obj with Object.values.

Then we call includes with the value we’re looking for in obj.

Conclusion

To check if a value exists in an object using JavaScript, we use the Object.values and the array includes method.

Sometimes, we want to get the number of digits with JavaScript.

In this article, we’ll look at how to get the number of digits with JavaScript.

How to get the number of digits with JavaScript?

To get the number of digits with JavaScript, we can convert the number to a string.

For instance, we write

const getlength = (number) => {
  return number.toString().length;
};

to define the getLength function that takes a number.

In it, we call toString to convert it to a string.

And then we get the length property of it to get the number of digits of number.

Conclusion

To get the number of digits with JavaScript, we can convert the number to a string.

Sometimes, we want to get HTML form values with JavaScript.

In this article, we’ll look at how to get HTML form values with JavaScript.

How to get HTML form values with JavaScript?

To get HTML form values with JavaScript, we use the FormData constructor with the form element.

For instance, we write

const handleSubmit = (e) => {
  e.preventDefault();
  const formData = new FormData(e.target);
  const formProps = Object.fromEntries(formData);
};

to create the handleSubmit function that calls e.preventDefault to prevent the default server side submission behavior.

Then we create a FormData object with e.target.

And then we convert the formData object that has the form values to an object with Object.fromEntries.

Conclusion

To get HTML form values with JavaScript, we use the FormData constructor with the form element.

Sometimes, we want to determine one year from now in JavaScript.

In this article, we’ll look at how to determine one year from now in JavaScript.

How to determine one year from now in JavaScript?

To determine one year from now in JavaScript, we call the getFullYear and setFullYear method.

For instance, we write

const d = new Date(new Date().setFullYear(new Date().getFullYear() + 1));

to get the 4 digit year of the current date time with

new Date().getFullYear()

Then we add 1 to it and call setFullYear with the sum to set the date to be 1 year from now.

And create a new Date object with the same date time by using Date with

new Date().setFullYear(new Date().getFullYear() + 1)

Conclusion

To determine one year from now in JavaScript, we call the getFullYear and setFullYear method.