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October 13, 2020 18:08
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| // Question 1: Create an Array from 0...100 without using traditional For-loop | |
| let array = Array(101).fill(1).map(item = (val , index) => index); | |
| console.log("array of 0 to 100 "); | |
| console.log(array); | |
| // Question 2: Create an Array of only even numbers from the above array | |
| let evenArray = array.filter( val => val % 2 == 0); | |
| console.log("array of even numbers"); | |
| console.log(evenArray); | |
| // Create a function that returns a Promise which returns the | |
| // square of only even numbers and | |
| // throws an error if an odd number is passed | |
| function getEvenSquare( a ){ | |
| return new Promise((resolve , reject)=>{ | |
| if( a % 2 == 0){ | |
| return resolve( a * a ); | |
| } | |
| else{ | |
| return reject( a + " is ODD " ); | |
| } | |
| }); | |
| } | |
| getEvenSquare(4) | |
| .then(result=>{ | |
| console.log("calling Promise 'resolve' for get even number squre and error for odd number"); | |
| console.log(result); | |
| }) | |
| .catch(err=>{ | |
| console.log("calling Promise 'reject' for get even number squre and error for odd number"); | |
| console.log(err); | |
| }) | |
| // Question 3: create an array of even squares using the previous array | |
| console.log("array of even squares"); | |
| let evenSqureArray = array.filter( val => val % 2 == 0 ).map( val => val * val ); | |
| console.log(evenSqureArray); | |
| // Question 4: Sum of all the squares from the above array of Even Squares | |
| var sum = evenSqureArray.reduce(function( sum , value ){ | |
| return sum + value; | |
| }, 0); | |
| console.log("Sum of all the squares from the above array of Even Squares"); | |
| //- 0 is value of initial value of sum | |
| console.log(sum); | |
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