let allow us to declare block-level variables and the value of the declared variable can be changed.
const allows us to declare a variable which values are never changed.
var is the most common keyword to use declared a variable. It doesn’t have any restrictions that the other two keywords have.
- , -, *, / and %
<, >, >=, <=
There are != and !== operators also.
o Dictionaries in Python
o Hashes in Perl and Ruby
o Hash table in C and C++
o HashMap’s in Java
o Associative arrays in PHP.
There is two basic way to create an empty object:
About Some String Prototype
The string object’s charAt() located a specified object into a string and return a new object.
The concat() method concatenates the string and returns a new string.
If the argument values are not strings, they should be converting string values before concatenating.
This method performs a case-sensitive search to found a new string within another string.