Category: JavaScript Answers

Sometimes, we want to get object property name with JavaScript.

In this article, we’ll look at how to get object property name with JavaScript.

How to get object property name with JavaScript?

To get object property name with JavaScript, we use the Object.keys method.

For instance, we write

const result = Object.keys(myVar);
console.log(result[0]);

to call Object.keys with myVar to return an array of property key strings in the myVar object.

Then we get the first key from the array with result[0].

Conclusion

To get object property name with JavaScript, we use the Object.keys method.

Sometimes, we want to iterate through property names of JavaScript object.

In this article, we’ll look at how to iterate through property names of JavaScript object.

How to iterate through property names of JavaScript object?

To iterate through property names of JavaScript object, we can use the Object.keys method.

For instance, we write

Object.keys(obj).forEach((key) => {
  console.log(key);
});

to call Object.keys with obj to return an array of string property keys in obj.

Then we call forEach with a function that logs the key, which is the property name string to loop through each element returned by Object.keys.

Conclusion

To iterate through property names of JavaScript object, we can use the Object.keys method.

Sometimes, we want to split a string by commas but ignore commas within double-quotes using JavaScript.

In this article, we’ll look at how to split a string by commas but ignore commas within double-quotes using JavaScript.

How to split a string by commas but ignore commas within double-quotes using JavaScript?

To split a string by commas but ignore commas within double-quotes using JavaScript, we can use the match method.

For instance, we write

const str = 'a, b, c, "d, e, f", , h, "i"';
const array = str.match(/("[^"]*")|[^,]+/g);
console.log(array);

to call str.match with a regex that matches substrings with commas but ignore commas within double-quotes.

We use ("[^"]*") to ignore the double quotes.

And we use [^,] to match the commas.

The g flag makes match return all matches.

array has all the matches.

Conclusion

To split a string by commas but ignore commas within double-quotes using JavaScript, we can use the match method.

Sometimes, we want to pass a JavaScript variable to another browser window.

In this article, we’ll look at how to pass a JavaScript variable to another browser window.

How to pass a JavaScript variable to another browser window?

To pass a JavaScript variable to another browser window, we can add a property to the window handle object.

For instance, we write

const thisIsAnObject = { foo: "bar" };
const w = window.open("http://example.com");
w.myVariable = thisIsAnObject;

to call window.open to open a new window.

Then we add the myVariable property to the w window handle object.

Conclusion

To pass a JavaScript variable to another browser window, we can add a property to the window handle object.

Sometimes, we want to use variable keys to access values in JavaScript objects.

In this article, we’ll look at how to use variable keys to access values in JavaScript objects.

How to use variable keys to access values in JavaScript objects?

To use variable keys to access values in JavaScript objects, we can use square brackets.

For instance, we write

const x = { test: "hi" };
alert(x.test);
alert(x["test"]);

to put "test" in the square brackets to return the value of the test property in x.

Therefore, x["test"] is 'hi'.

Conclusion

To use variable keys to access values in JavaScript objects, we can use square brackets.