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Mar 23rd, 2019
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  1. //map operator..
  2. let arr1 = [1,2,3,4,5];
  3. arr1.forEach((val, index,arr)=> val *3 );
  4. arr1
  5. let arr2= arr1.map((val,index,arr) => val * 2);
  6. arr2
  7. let arr3 = arr2.filter((val,index,arr)=> val >=6);
  8.  
  9. arr3;
  10.  
  11. arr1.reduce((acc,curVal)=> acc + curVal);
  12.  
  13. let arr = [1, 2, 3, 4, 5];
  14. arr.forEach((num, index) => {
  15. return arr[index] = num * 2;
  16. });
  17. arr
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