1. Arrow Functions | JavaScript | ES6

Aug 30, 2017Download as PPTX, PDF3 likes817 views

Arrow function expressions are new functions available in ES6. Using arrow function expressions we can reduce function coding. In Arrow function expressions there is no this inside arrow function. if you call this it will take immediate parent's context.

Agenda
 Background
 Introduction to Arrows
 Basic Syntax
 Advanced Syntax
 Live Examples

Background
Function Expression:
A Function Expression is used to define a function inside an
expression using function keyword.
Example:
var sayHai = function ( name ) { return “Hai “ + name; };

Introduction to Arrows
 Arrows are shorthand function expressions.
 Arrows are syntactically similar to the related feature in C#, Java8 and Coffee
Script.
 Arrows supports block statements as well as expression which returns the value of
expression.
 We cannot use Arrow as constructor.
 Arrows doesn’t have this, arguments, super.

Introduction to Arrows(cont…)
 Two major factors influenced the introduction of arrows. Those are
 Shorter Functions.
 Non-Binding of ‘this’.

Basic Syntax
( param1, param2, …., paramN ) => { statements } // multi-line
( param1, param2, …, paramN ) => expression // single line
single Parameter => { statements } // Parentheses are optional for single param
() => { statements } // Arrows without params

Advanced Syntax
param => ( { statements } ) // return object literal expression
( param1, param2, …rest ) => { statements } // rest parameters
( pram1 = default1, param2 = default2 ) => { statements } // default values
Let f = ( [ parm1, param2 ] = [ val1, val2 ] ) => expression // Destructuring

Live Examples
Simple Example:
var sayHai = () => { alert(‘Hai’) };
sayHai();

Live Examples
Expressions Example:
var numbers = [1,2,3,4,5];
var incrementByIndex = numbers.map((num, index) => num+index);

Live Examples
Blocked Statements Example:
var nums = [1,2,3,4,5];
nums.map( num => {
if ( num % 2 == 0 ) {
return num;
}
} );

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1. Arrow Functions | JavaScript | ES6

1. Arrows | ES6 JAGADEESH PATTA ( PJ )

2. Agenda  Background  Introduction to Arrows  Basic Syntax  Advanced Syntax  Live Examples

3. Background Function Expression: A Function Expression is used to define a function inside an expression using function keyword. Example: var sayHai = function ( name ) { return “Hai “ + name; };

4. Introduction to Arrows  Arrows are shorthand function expressions.  Arrows are syntactically similar to the related feature in C#, Java8 and Coffee Script.  Arrows supports block statements as well as expression which returns the value of expression.  We cannot use Arrow as constructor.  Arrows doesn’t have this, arguments, super.

5. Introduction to Arrows(cont…)  Two major factors influenced the introduction of arrows. Those are  Shorter Functions.  Non-Binding of ‘this’.

6. Basic Syntax ( param1, param2, …., paramN ) => { statements } // multi-line ( param1, param2, …, paramN ) => expression // single line single Parameter => { statements } // Parentheses are optional for single param () => { statements } // Arrows without params

7. Advanced Syntax param => ( { statements } ) // return object literal expression ( param1, param2, …rest ) => { statements } // rest parameters ( pram1 = default1, param2 = default2 ) => { statements } // default values Let f = ( [ parm1, param2 ] = [ val1, val2 ] ) => expression // Destructuring

8. Live Examples Simple Example: var sayHai = () => { alert(‘Hai’) }; sayHai();

9. Live Examples Expressions Example: var numbers = [1,2,3,4,5]; var incrementByIndex = numbers.map((num, index) => num+index);

10. Live Examples Blocked Statements Example: var nums = [1,2,3,4,5]; nums.map( num => { if ( num % 2 == 0 ) { return num; } } );

11. Any Q ?

12. Thank You

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