Category: JavaScript Answers

Sometimes, we want to hide certain values in output from JSON.stringify() with JavaScript.

In this article, we’ll look at how to hide certain values in output from JSON.stringify() with JavaScript.

How to hide certain values in output from JSON.stringify() with JavaScript?

To hide certain values in output from JSON.stringify() with JavaScript, we call JSON.stringify with an array of property keys that we want to include with the returned JSON string.

For instance, we write

const x = {
  x: 0,
  y: 0,
  divID: "xyz",
  privateProperty1: "foo",
  privateProperty2: "bar",
};

const str = JSON.stringify(x, ["x", "y", "divID"]);

to call JSON.stringify with object x and an array of keys from x that we want to include in the returned JSON string.

As a result, str is '{"x":0,"y":0,"divID":"xyz"}'.

Conclusion

To hide certain values in output from JSON.stringify() with JavaScript, we call JSON.stringify with an array of property keys that we want to include with the returned JSON string.

Sometimes, we want to get the text of a div tag using only JavaScript.

In this article, we’ll look at how to get the text of a div tag using only JavaScript.

How to get the text of a div tag using only JavaScript?

To get the text of a div tag using only JavaScript, we can use the textContent property.

For instance, we write

const el = document.getElementById("foo");
const textContent = el.textContent;

to select the element with getElementById.

Then we get the text of the element with the textContent property.

Conclusion

To get the text of a div tag using only JavaScript, we can use the textContent property.

Sometimes, we want to get the HTML for a DOM element in JavaScript.

In this article, we’ll look at how to get the HTML for a DOM element in JavaScript.

How to get the HTML for a DOM element in JavaScript?

To get the HTML for a DOM element in JavaScript, we can use the outerHTML property.

For instance, we write

const el = document.getElementById("foo");
console.log(el.outerHTML);

to select the element with getElementById.

Then we use the outerHTML property to get the HTML string for the element.

Conclusion

To get the HTML for a DOM element in JavaScript, we can use the outerHTML property.

Sometimes, we want to detect if a variable is an array with JavaScript.

In this article, we’ll look at how to detect if a variable is an array with JavaScript.

How to detect if a variable is an array with JavaScript?

To detect if a variable is an array with JavaScript, we use the Array.isArray method.

For instance, we write

const isArray = Array.isArray([]);

to check if the empty array is an array with Array.isArray.

It should return true since it’s an array.

Otherwise, it’ll return false.

Conclusion

To detect if a variable is an array with JavaScript, we use the Array.isArray method.

Sometimes, we want to remove numbers from a string with JavaScript.

In this article, we’ll look at how to remove numbers from a string with JavaScript.

How to remove numbers from a string with JavaScript?

To remove numbers from a string with JavaScript, we can use the string replace method with a regex.

For instance, we write

const newQuestionText = questionText.replace(/[0-9]/g, "");

to call questionText.replace with the /[0-9]/g regex to match all numbers in the questionText string.

Then we replace them all with empty strings.

Conclusion

To remove numbers from a string with JavaScript, we can use the string replace method with a regex.