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what is function

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Function is the set or collection of instructions which are kept in the box called function.which when we executes it pefroms a specific task as its output..

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Types of Functions In JavaScript

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  1. \n

    Named Function

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    function sum(a,b) {\nreturn a+b;\n}
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    Named function means that function declaration with name eg i have given name to function above is sum

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    2. \n
  2. \n

    Anonymous Functions

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    var sum = function (a,b) {\nreturn a+b;\n}
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    Anonymous Function or function expression means function without name

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    3. \n
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    Immediately invoked function expression (IIFE)

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    function (a,b) {\nreturn a+b;\n})(a,b)
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    An IIFE (Immediately Invoked Function Expression) is a JavaScript function that runs as soon as it is defined.

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    4. \n
  4. \n

    Function Execution Or Invocation

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    It simply means that the giving command to function for executing the collection of code which we have put inside it

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    5. \n
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for example:\nHere im executing the one of function which i have defined above

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sum(1,2);
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*we can execute the function by its name i have provide arguments inside the brackets at time of execution so the output will be 3.the provided agruments will go inside the parameters which i define above in the function declaration.*

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  1. \n

    Different Components Of Functions

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    Genrelly The Main Components Of The Functions Are

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    2. \n
  2. Function Keyword
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  3. Function Name
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  4. Parameters Of The Function
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  5. Return Statement in The Function If Not Provided It Will Going To Return The Undefined
    6. \n
  6. Arguments In The Function at Execution Time
    7. \n
","frontmatter":{"title":"Functions in js","date":"September 04, 2019","description":"Complete Particulars About The Functions in JavaScript "}}},"pageContext":{"isCreatedByStatefulCreatePages":false,"slug":"/functions in js/","previous":null,"next":{"fields":{"slug":"/dataTpes in js/"},"frontmatter":{"title":"DataTypes in javaScript"}}}}}