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JavaScript | Statements

  • Difficulty Level : Basic
  • Last Updated : 25 Mar, 2019

The programming instructions written in a program in a programming language are known as statements.

Order of execution of Statements is the same as they are written.

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  1. Semicolons:
    • Semicolons separate JavaScript statements.
    • Semicolon marks the end of a statement in javascript.


      <!DOCTYPE html>
          <p id="geek"></p>
              // Statement 1
              var a, b, c;
              // Statement 2
              a = 2;
              // Statement 3
              b = 3;
              // Statement 4
              c = a + b;
                "geek").innerHTML =
                  "The value of c is " + c + ".";


    • Multiple statements on one line are allowed if they are separated with a semicolon.
  2. Code Blocks:
    JavaScript statements can be grouped together inside curly brackets. Such groups are known as code blocks. The purpose of grouping is to define statements to be executed together.

    Example:JavaScript function

    <!DOCTYPE html>
        <button type="button" 
          Click Me!
        <p id="geek1"></p>
        <p id="geek2"></p>
            function myFunction() {
                  "geek1").innerHTML = "Hello";
                  "geek2").innerHTML = 
                  "How are you?";

    Before Click:

    After Click:

  3. White Space:
    • Javascript ignores multiple white spaces.

    Javascript would treat following 2 statements as same:

    var a="Hello Geek";
    var a = "Hello Geek";
  4. Line Length and Line Breaks:
    Javascript code preferred line length by most programmers is upto 80 characters.
    The best place to break a code line in Javascript, if it doesn’t fits, is after an operator.
    document.getElementById("geek1").innerHTML =
    "Hello Geek!";
  5. Keywords:
    Keywords are reserved words and cannot be used as variable name.
    A Javascript keyword tells about what kind of operation it will perform.

    Some commonly used keywords are:

    • break: This is used to terminate a loop or switch.
    • continue: This is used to skip a particular iteration in a loop and move to next iteration.
    • do…. while: In this the statements written within do block are executed till the condition in while is true.
    • for: It helps in executing a block of statements till the condition is true.
    • function: This keyword is used to declare a function.
    • return: This keyword is used to exit a function.
    • var: This keyword is used to declare a variable.
    • switch: This helps in executing a block of codes depending on different cases.

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