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Basics

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https://leetcode.com/problems/palindrome-linked-list/description/ https://www.w3schools.com/jsref/jsref_slice_array.asp   const arr=[1,2] ; console.log(arr.reverse().join()===arr.join()); ChatGPT The expression arr.reverse() reverses the order of elements in the arr array in place, meaning it modifies the original array. The arr.join() method converts the elements of the array into a string, with each element separated by a comma by default. In the given code, arr.reverse().join() returns a string representation of the reversed array. However, the original arr array has also been reversed because the reverse() method modifies the array directly. Therefore, arr.reverse().join() === arr.join() will evaluate to true because both sides of the comparison refer to the same array that has been reversed and then converted to a string. const newarr =arr; return newarr.reverse().join()===arr.join() ; ChatGPT In the code you provided, newarr is assigned the reference to the arr ...
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TO the new

 const arr= [1,2,3,2,3,4,5,6,6,1,3,2]; let output=arr.reduce((acc,curr)=>{   if(acc[curr]){     acc[curr]+=1;   }   else{     acc[curr]=1;   } return acc; },{}) console.log(output) // const arr =[1,2,3,4,5,6]; // const arrMap =(logic,arr)=>{ //   let output=[]; //   for(let i=0;i<=arr.length,i++){ //     let data= logic(arr[i]); //     output.push(data) //   } //   return output; // } // arrMap((element)=>{ //   element*2; // },arr) const  name='Ankit'.split(''); for(let i=name.length-1;i>=0;i--){   console.log(name[i]) }
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Magic edtech

 https://codepen.io/ankittyagi206/pen/GRLbRNy // function outer(x){ //     return function(y){ //         return x*y; //     } // } // console.log(outer(3)(4)) //map --> [] --> [] const obj={     name:'ankit' } const obj2= {...obj,...{     age:26 }} delete obj2.name console.log(obj2,obj) deep copy shallow copy promises async await // Given a string S containing alphanumeric characters, // The task is to calculate the sum of all numbers present in the string. // Output: 24 // Explanation: 1 + 23 = 24 // const input=  '1abc22' // function calculateSum(input){ //   let numArr =[];    //   for(let i=0; i<input.length;i++){ //     if(+input[i] && +input[i+1]){ //       let newNum=Number([input[i],input[i+1]].join('')); //       numArr.push(newNum) //     } //     else if(+input[...
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