JavaScript Function Invocation

The JavaScript Function Invocation is used to execute the function code and it is common to use the term “call a function” instead of “invoke a function”. The code inside a function is executed when the function is invoked. 

Syntax: 

• Invoking a Function as a Function: 

function myFunction( var ) {
    return var;
}
myFunction( value );

• Invoking a Function as a Method: 

let myObject = {
    let : value,
    functionName: function () {
        return this.let;
    }
}
myObject.functionName();  

Parameters: It contains two parameters as mentioned above and described below:

• functionName: The functionName method is a function and this function belongs to the object and myObject is the owner of the function.
• this: The parameter this is the object that owns the JavaScript code and in this case the value of this is myObject.

Example 1: This example uses function invocation to add two numbers. 

Output:  

 

Example 2: This example uses function invocation to concatenate strings. 

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