- 1 What does || mean in JS?
- 14 What does the ++ mean?
What does || mean in JS?
The Logical OR operator ( || ) is an operator that returns its first or second operand depending on whether the first is truthy. A “truthy” value means anything other than 0, undefined, null, “”, or false.
The left shift operator ( << ) shifts the first operand the specified number of bits to the left. Excess bits shifted off to the left are discarded. Zero bits are shifted in from the right.
A comparison operator compares its operands and returns a logical value based on whether the comparison is true. The operands can be numerical, string, logical, or object values. Strings are compared based on standard lexicographical ordering, using Unicode values.
The increment operator adds 1 to the operand and the decrement operator subtracts 1 from the operand.
Classes are a template for creating objects. They encapsulate data with code to work on that data. Classes in JS are built on prototypes but also have some syntax and semantics that are not shared with ES5 class-like semantics.
What does the ++ mean?
++ is the increment operator. It increment of 1 the variable. x++; is equivalent to x = x + 1; or to x += 1; The increment operator can be written before (pre – increment) or after the variable (post-increment).
When we talk about implementing a delay function, the most widely used method is the asynchronous setTimeout().