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Last Updated on: October 10, 2022 Unlike most other programming languages, you can use both undefined and null values in JavaScript. This can confuse someone who comes to JavaScript from another programming language. When an object is undefined, it means that it still has to be declared or has been declared and not given a…

Last Updated on: October 10, 2022 It is common to want to join several smaller strings into a large string. The obvious way to do this is with a string concatenation operation, but in JavaScript, this can have a negative effect on performance. This is because the string concatenation operations can produce too many intermediate…

Last Updated on: October 10, 2022 If you have come to JavaScript from a background in Java or C, you will like the variation on the “for loop“. It is similar to the “for loop” in Perl, Python or PHP but with a little twist. You can use a for loop to repeatedly run a…

Last Updated on: October 10, 2022 JavaScript has member functions for all objects, such as “valueOf” and “toString”. When you use literal numbers, Booleans, strings, undefined and null are different from the counterparts that you use for objects. This example shows this: There are ways that you can implicitly convert an object into a literal…

Last Updated on: September 15, 2022 Assertion is a technique you can use to debug JavaScript code. You use assertion to ensure that an expression evaluates to true during script execution. This means that if any expression evaluates to false, there is possibly a bug in your code. There is no inbuilt assert function in…

Last Updated on: September 15, 2022 JavaScript allows the use of anonymous functions with full closures. Functions are objects, and you can pass them as arguments like any other object. The scope of a function includes all the names in the scope where it was declared. As you declare functions at run time and local…