Question

How to create a new array with a specified range of numbers in TypeScript

Answer 1

let len: number = 10;
 
const arr: number[] = Array.from({ length: len }, (_, i) => i)
 
  
console.log(arr);
  
  
  
       
/*
run:
     
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
   
*/

 

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Answer 2

let len: number = 10;
 
const arr: number[] = Array.from({ length: len }, (_, i) => i * 2)
 
  
console.log(arr);
  
  
  
       
/*
run:
     
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18] 
   
*/

 

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Answer 3

const arrayValueRange = (start: number, stop: number, step: number) =>
    Array.from(
    { length: (stop - start) / step + 1 },
    (value, index) => start + index * step
    );
 
const arr: number[] = arrayValueRange(3, 14, 2);
 
  
console.log(arr);
  
  
  
       
/*
run:
     
[3, 5, 7, 9, 11, 13]
   
*/

 

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