6. Default parameters | ES6 | JavaScript

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Default function parameters allow parameters to be initialized with default values if no value is passed when calling the function. Default parameters can be destructured and the default values can be functions that are evaluated at call time. An example shows a function that returns an employee ID with a default value if no ID is passed, and another function that returns a full name using default first and last name values if not passed.

Default Params | ES6
JAGADEESH PATTA ( PJ )

Agenda
 Introduction to Default Parameters
 Destructured params with Default Values.
 Evaluated Default params at function call.
 Live Example

Introduction
 Default function parameters allow formal parameters to be initialized with
default values if no value or undefined is passed from calling function.
 In JavaScript the default function parameter value is undefined.

$Introduction(cont…) Syntax function function_name(param = default_value){ // function body. }$

Introduction(cont…)
Example
function getEmployeeDetails(empId = pj001){
return `The employee id is : ${ empId }`;
}
getEmployeeDetails(‘pj123’); // empId is pj123
getEmployeeDetails(); // here empId is pj001

$Default Params – Destructured Params  We can initialize default params using Destructured params. Syntax function function_name([param_1, param_2] = [val_1, val_2]){ // Function body. }$

Default Params – Destructured Params
Example
function getFullName([fName, lName] = [‘P’, ‘J’]){
return fName +” ”+ lName;
}
getFullName();
getFullName([‘Patta’,’Jagadeesh’]);

$Default Params – Function call  We can initialize default params by calling function calls. Syntax function function_name( param = function() ){ // Function body. }$

Default Params – Function call
Example
function getFullName( firstName = getLastName( ), lastName ){
return firstName + “ ” + lastName;
}
function getLastName() { return “emp”; }
getFullName( undefined, ‘PJ’ );

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6. Default parameters | ES6 | JavaScript

1. Default Params | ES6 JAGADEESH PATTA ( PJ )

2. Agenda  Introduction to Default Parameters  Destructured params with Default Values.  Evaluated Default params at function call.  Live Example

3. Introduction  Default function parameters allow formal parameters to be initialized with default values if no value or undefined is passed from calling function.  In JavaScript the default function parameter value is undefined.

4. Introduction(cont…) Syntax function function_name(param = default_value){ // function body. }

5. Introduction(cont…) Example function getEmployeeDetails(empId = pj001){ return `The employee id is : ${ empId }`; } getEmployeeDetails(‘pj123’); // empId is pj123 getEmployeeDetails(); // here empId is pj001

6. Default Params – Destructured Params  We can initialize default params using Destructured params. Syntax function function_name([param_1, param_2] = [val_1, val_2]){ // Function body. }

7. Default Params – Destructured Params Example function getFullName([fName, lName] = [‘P’, ‘J’]){ return fName +” ”+ lName; } getFullName(); getFullName([‘Patta’,’Jagadeesh’]);

8. Default Params – Function call  We can initialize default params by calling function calls. Syntax function function_name( param = function() ){ // Function body. }

9. Default Params – Function call Example function getFullName( firstName = getLastName( ), lastName ){ return firstName + “ ” + lastName; } function getLastName() { return “emp”; } getFullName( undefined, ‘PJ’ );

10. Any Q ?

11. Thank You

6. Default parameters | ES6 | JavaScript

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