What are control statements in JavaScript?
Control statements are designed to allow you to create scripts that can decide which lines of code are evaluated, or how many times to evaluate them. There are two different types of control statements: conditional statements and loop statements.
What are expressions in JavaScript?
An expression is any valid set of literals, variables, operators, and expressions that evaluates to a single value. The value may be a number, a string, or a logical value. Conceptually, there are two types of expressions: those that assign a value to a variable, and those that simply have a value.
What are the types of control structures in JavaScript?
Following are the several control structure supported by javascript.
- if … else.
- switch case.
- do while loop.
- while loop.
- for loop.
What are the different control structures in JavaScript explain with examples?
Difference between While Loop and Do – While Loop
| While Loop | Do – While Loop |
|---|---|
| In while loop, first it checks the condition and then executes the program. | In Do – While loop, first it executes the program and then checks the condition. |
| It is an entry – controlled loop. | It is an exit – controlled loop. |
What are examples of control structures?
Flow of control through any given function is implemented with three basic types of control structures:
- Sequential: default mode.
- Selection: used for decisions, branching — choosing between 2 or more alternative paths.
- Repetition: used for looping, i.e. repeating a piece of code multiple times in a row.
What is JavaScript and its types?
JavaScript has six primitives types: string , number , undefined , null , boolean , and symbol . There is also a compound type or object . Interestingly, the primitive types are immutable and don’t have properties. The types in JavaScript look simple and useless but knowing how they work is important.
What are the four basic capabilities of JavaScript?
JavaScript’s dynamic capabilities include runtime object construction, variable parameter lists, function variables, dynamic script creation (via eval ), object introspection (via for in ), and source code recovery (JavaScript programs can decompile function bodies back into their source text).