ashwinkumar2438

//takes function to be debounced and delay time to fire.  
/*returns passed function wrapped with settimeout to delay fire
and updates to settimeout whenever called. */
let debounce=(fn,timedelay)=>{
        let timerid=null;
        return function(){
            clearTimeout(timerid);
            timerid=setTimeout(fn.bind(this,...arguments),timedelay);
        }
    };

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//takes the function to be throttled and time delay in between subsequent fires as parameters. 
//returns the passed function wrapped with settimeout and pass check. Takes latest arguments in subsequent calls.
 let throttle=(fn,timedelay)=>{
        let ref={pass:true,arguments:[]};
        return function(){
            ref.arguments=arguments;
            if(ref.pass){
                setTimeout(()=>{
                    fn.apply(this,ref.arguments);
                    ref.pass=true;

ashwinkumar2438

let createState=(initialvalue)=>{

    let state={...initialvalue};

    let getstate=()=>({...state});


    let setstate=(input)=>{

        if(input.constructor===Object)state={...state,...input};

ashwinkumar2438

//map function.
var map=(array,operator)=>{

let maparr=[];

for(let i=0;i<array.length;i++){
    maparr.push(operator(array[i],i,array))
}
return maparr;
}

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// Compose Function
var compose=(...args)=>(input)=>args.reduceRight((acc,fn)=>fn(acc),input);
var resulant=compose(h,g,f); //(input)=>h(g(f(input)));

// Pipe Function
var pipe=(...args)=>(input)=>args.reduce((acc,fn)=>fn(acc),input);
var resulant=pipe(f,g,h); //(input)=>h(g(f(input)));

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var url="www.go.myurlexample.com/007w3?id1=123&id2=abc";

var getLastString=(param)=>(string)=>string.split(param).slice(-1).join();

var split=(param)=>(string)=>string.split(param);

var getParamObj=(arr)=>arr.reduce((acc,str)=>{
var arr=split("=")(str);
acc[arr[0]]=arr[1];
return acc;}

ashwinkumar2438

//Curried Function taking two parameters.
var repeatString=(string)=>(count)=>Array(count).fill(string).join("");

//Creating custom functions with currying.
var repeatStar=repeatString("*"); // (count)=>Array(count).fill("*").join("");
var repeatSpace=repeatString(" "); // (count)=>Array(count).fill(" ").join("");

for(let i=0;i<8;i++){
console.log(repeatSpace(8-i)+repeatStar(2*i+1));
}

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//Global Scope.
var globaldata={user:"xyz",loggedin:false,currentstate:"none"}
var userinput="Current State Info";

/* Impure way of handling login. Changing Global State,
operation is dependent upon global variable 'userinput',
no return value.
*/
var login=(globaldata)=>{
globaldata.loggedin=true;

ashwinkumar2438

var regex=/\d/y;
regex.lastIndex=3;
regex.exec("0123")[0]; // returns '3' instead of '0' as the regex starts the search from the index 3 of string.

ashwinkumar2438

//Using two flags 'g' and 'm' together on a Regex. 
var regex1= /^[0-9]{9,10}/gm; //    /^[0-9]{9,10}/gm
var regex2= new RegExp("^[0-9]{9,10}","gm") //  /^[0-9]{9,10}/gm