How to format a JavaScript date

For custom-delimited date formats, you have to pull out the date (or time) components from a DateTimeFormat object (which is part of the ECMAScript Internationalization API), and then manually create a string with the delimiters you want. To do this, you can use DateTimeFormat#formatToParts. You could destructure the array, but that is not ideal, as the array output depends … Read more

How to append something to an array?

Use the Array.prototype.push method to append values to the end of an array:  Run code snippet You can use the push() function to append more than one value to an array in a single call:  Run code snippet Update If you want to add the items of one array to another array, you can use firstArray.concat(secondArray):  Run code snippet Update … Read more

How to do associative array/hashing in JavaScript

Use JavaScript objects as associative arrays. Associative Array: In simple words associative arrays use Strings instead of Integer numbers as index. Create an object with JavaScript allows you to add properties to objects by using the following syntax: An alternate syntax for the same is: If you can, also create key-to-value object maps with the following … Read more

Which equals operator (== vs ===) should be used in JavaScript comparisons?

The strict equality operator (===) behaves identically to the abstract equality operator (==) except no type conversion is done, and the types must be the same to be considered equal. Reference: Javascript Tutorial: Comparison Operators The == operator will compare for equality after doing any necessary type conversions. The === operator will not do the conversion, so if two values are not the … Read more

How do you use the ? : (conditional) operator in JavaScript?

This is a one-line shorthand for an if-else statement. It’s called the conditional operator.1 Here is an example of code that could be shortened with the conditional operator: This can be shortened with the ?: like so: Like all expressions, the conditional operator can also be used as a standalone statement with side-effects, though this is unusual outside of … Read more

How do you use the ? : (conditional) operator in JavaScript?

This is a one-line shorthand for an if-else statement. It’s called the conditional operator.1 Here is an example of code that could be shortened with the conditional operator: This can be shortened with the ?: like so: Like all expressions, the conditional operator can also be used as a standalone statement with side-effects, though this is unusual outside of … Read more

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