Variables are declared using the keyword ‘var’ followed by the name of the variable. For example, to declare a variable called ‘myVar’, you would write ‘var myVar’. Variables can be assigned values using the assignment operator ‘=’. For example, to assign the value ’10’ to the variable ‘myVar’, you would write ‘myVar = 10’. Variables can also be used to store the result of a function or expression. For example, to store the result of the expression ‘2 + 2’ in a variable called ‘myVar’, you would write ‘myVar = 2 + 2’.
Objects are particularly useful when working with large amounts of data, as they can store multiple values in a single variable. Additionally, objects can be used to create relationships between different pieces of data, allowing developers to easily access related information. This makes objects a powerful tool for organizing and manipulating data.
Control flow is responsible for determining which code should be executed in response to certain events. Control flow also provides ways to repeat code using loops such as for, while and do while loops. These loops enable developers to quickly iterate through a collection of data and execute code on each item in the collection.
Functions are self-contained blocks of code that can be called upon to perform specific tasks. When a function is called, it executes the code inside its block and returns a value if necessary. Functions can take parameters which can be used to customize the outcome of the function. Functions are useful for breaking down complicated tasks into smaller reusable pieces of code.