Question

How to create a zero filled array in JavaScript

Answer 1

let arr = new Array(20).fill(0);
 
arr[3] = 888;
arr[17] = 999;
 
for (let i = 0; i < 20; i++) {
    console.log(arr[i]);
}
 
 
     
     
/*
run:
      
0
0
0
888
0
0
0
0
0
0
0
0
0
0
0
0
0
999
0
0
      
*/

 

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Answer 2

let arr = new Array(10).fill(0);
 
arr[3] = 888;
arr[17] = 999;

 
for (let i = 0; i < arr.length; i++) {
    console.log(arr[i]);
}
 
 
     
     
/*
run:
      
0
0
0
888
0
0
0
0
0
0
undefined
undefined
undefined
undefined
undefined
undefined
undefined
999
      
*/

 

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