Question

How to move an item of an array to the first position in TypeScript

Answer 1

let arr : string[] = ["typescript", "java", "c", "c++", "c#"];

const first = "c";

arr.sort(function(x, y){ return x == first ? -1 : y == first ? 1 : 0; });
 
console.log(arr); 
 
 

 
/*
run:
 
["c", "typescript", "java", "c++", "c#"] 
 
*/

 

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Answer 2

let arr : string[] = ["typescript", "java", "c", "c++", "c#"];

const index = 2;

arr.unshift(arr.splice(index, 1)[0]);
  
console.log(arr); 
  
  
 
  
/*
run:
  
["c", "typescript", "java", "c++", "c#"] 
  
*/

 

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Answer 3

let arr : string[] = ["typescript", "java", "c", "c++", "c#"];

const index = arr.indexOf('c');

arr.unshift(arr.splice(index, 1)[0]);
  
console.log(arr); 
  
  
 
  
/*
run:
  
["c", "typescript", "java", "c++", "c#"] 
  
*/

 

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