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As far as I know IIFEs look like this.

(function() {
  // Some code
})();

Or may be

(function () { 
    ... 
}())

But I have a js which looks something like the following.

Are these functions IIFEs? Who is calling them? What is invoking them? I am able to place debugger and debug the methods.

(function (definition) {
    "use strict";

    if (typeof exports === "object" && typeof module === "object") {
        module.exports = definition( require('./chartiq') );
    } else if (typeof define === "function" && define.amd) {
        define(["chartiq"], definition);
    } else if (typeof window !== "undefined" || typeof self !== "undefined") {
        var global = typeof window !== "undefined" ? window : self;
        definition(global);
    } else {
        throw new Error("Only CommonJS, RequireJS, and <script> tags supported for quoteFeedSimulator.js.");
    }
})

(function(_exports){
  var CIQ=_exports.CIQ;
    var quoteFeedSimulator=_exports.quoteFeedSimulator={}; // the quotefeed object

    quoteFeedSimulator.generateGUID=function(){
            .......
    };

    quoteFeedSimulator.maxTicks=50000;

    // called by chart to fetch initial data
    quoteFeedSimulator.fetchInitialData=function (symbol, suggestedStartDate, suggestedEndDate, params, cb) {
            .......
    };

    // called by chart to fetch update data
    quoteFeedSimulator.fetchUpdateData=function (symbol, startDate, params, cb) {
            .......
    };

    // called by chart to fetch pagination data
    quoteFeedSimulator.fetchPaginationData=function (symbol, suggestedStartDate, endDate, params, cb) {
            .......
    };

    // utility function to format data for chart input; given simulator was designed to work with library, very little formatting is needed
    quoteFeedSimulator.formatChartData=function (response) {
        var feeddata=JSON.parse(response);
        var newQuotes=[];
            .......
        return newQuotes;
    };

    return _exports;

});

In the above code, the first anonymous function:

function (definition) {
  ...
}

accepts the second anonymous function:

function (_exports) {
  ...
}

as an argument. The second function is then called from within the body of the first function with var global from the local scope of the first function as an argument. A simplified version of what is happening:

// The following code will log 'hey'

(function(defenition) {
   const global = 'hey';
   definition(global);
)(function(_exports) {
   console.log(_exports);
});

javascript, In the above code, the first anonymous function: function (definition) { } accepts the second anonymous function: function (_exports) { }. To call a function, you use its name followed by the function arguments enclosed in parentheses, like this: functionName(arguments); When you call a function, the function executes the code inside its body. This process is also known as invocation. In other words, you call a function or invoke a function to execute it.

Basically it is an IIFE, where the function's parameters is a function itself.

The handed over function is definition, which keeps the function which is later called.

(function (definition) {

})(function(_exports) { /* ... */ });

Is it possible to call a function without parenthesis - JavaScript, I'm trying to simulate symbolic math as follows: var a = 1; var b = 2; function c() { return a + b; } var d = 3; var e = c() * d; Is it possible to somehow call c without  // Declaring a function called myFunction function myFunction() { // Function actions } The declaration of a function is performed using the JavaScript keyword function, followed by the function name and a pair of parentheses. Instructions that make up the function constitute the body of the function.

IIFEs - Immediately Invoked Function Expressions. Its means when we need we can invoke a function inside a function expression. Its same as we are using callbacks.

That means we are invoking a function inside another function as a parameter, so that we can use that parameterised function inside it. Here is the example.

//This is my callback function/ IIFE
function foo(param){
  console.log("I am from foo - "+ param);
}

//I am creating another function who take foo function as a parameter.
(function(iamfoo){
  iamfoo(1); //foo will call with param 1
  console.log("I am calling foo"); // print this message
  iamfoo(2); //  agian foo will call with param 2
})(foo); // foo as a parameter

Output will be:

I am from foo - 1
I am calling foo
I am from foo - 2

Immediately invoked function expression, An immediately invoked function expression (or IIFE, pronounced "iffy") is a JavaScript A common convention is to enclose the function expression – and optionally its invocation operator – with the grouping operator, in parentheses, In contexts where an expression is expected, wrapping in parentheses is not necessary:. Invoking ok() works fine, without errors. 2. Function expression. A function expression is determined by a function keyword, followed by an optional function name, a list of parameters in a pair of parenthesis (para1, , paramN) and a pair of curly braces { } that delimits the body code. Some samples of the function expression:

Why are parenthesis used to wrap a JavaScript function call?, In JavaScript, the functions wrapped with parenthesis are called “Immediately Invoked Function Expressions or Self Executing Functions. For more examples and explanations, see also the JavaScript guide about functions. Description. Every function in JavaScript is a Function object. See Function for information on properties and methods of Function objects. To return a value other than the default, a function must have a return statement that specifies the value to return. A function without a return statement will return a default value.

JavaScript: The Definitive Guide, new operator creates a new object and invokes a constructor function to initialize it. new by zero or more comma-separated arguments enclosed in parentheses. the parentheses to be omitted if there are no arguments in the function call. Functions are one of the fundamental building blocks in JavaScript. A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.

JavaScript: The Definitive Guide: The Definitive Guide, In client-side JavaScript, however, typeof typically evaluates to “object” for all clientside The new operator creates a new object and invokes a constructor function to by zero or more comma-separated arguments enclosed in parentheses. by allowing the parentheses to be omitted if the function call has no arguments. What do you call the value that the function uses to perform a calculation, including a number, or a cell reference that acts as an operand? The argument What follows the function name and is enclosed in parenthesis?

Comments
  • (function (arg) {...})(function () {...}); where the latter function is arg, i.e. this is an IIFE.
  • As there is no semicolon, the next bracket is the argument.
  • It's an issue of JS's sometimes-optional whitespace: smush them together.