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package-info.txt
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package-info.txt
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views - contains the pages of web apps
components - contains the small view components
# info
Hooks is use to use "state" in function
props - properties of component, cannot be changed
state - data in the component, can be changed.
setState - asynchronous method, use to update the value in state and render the component again., have previos state function.
Destructureing component - taking out values from component. cont {message,errorcode} from this.state or props .
Binding Event Handler - this keyword is undefined in clickHandler function. So Event Binding used.
#approach 1
onClick = {this.clickHandler.bind(this)}
#approach 2
onClick = {()=>this.clickHandler()}
#approach 3
constructor() {
//add below line to make this work.
this.clickHandler = this.clickHandler.bind(this);
}
#approach 4
convert the clickHandler function to ES6 functions
clickHandler = () => {
}
*************************************************
//Callback function explained
let add = function(a,b){
return a+b;
}
let multiply = function(a,b){
return a*b;
}
let calculate = function(num1,num2,operationFunctionCallback){
return operationFunctionCallback(num1,num2);
}
//for addtion
console.log(calculate(2,5,add));
//for multiply
console.log(calculate(2,5),multiply);
***************************************************