Question

How to sort an array so that null values always come last in TypeScript

Answer 1

function nullLast(ascending : boolean) {
  return function (a:any, b:any) {
    if (a === b) {
        return 0;
    }
    else if (a === null) {
        return 1;
    }
    else if (b === null) {
        return -1;
    }
    else if (ascending) {
        return a < b ? -1 : 1;
    }
    else { 
        return a < b ? 1 : -1;
    }
  };
}


const arr = ["php", "c++", null, "typescript", "c", null, "nodejs", null, "javascript", "java"]; 
 
arr.sort(nullLast(true));
console.log(arr);

arr.sort(nullLast(false));  
console.log(arr);

   
    
    
    
/*
run:
    
["c", "c++", "java", "javascript", "nodejs", "php", "typescript", null, null, null] 
["typescript", "php", "nodejs", "javascript", "java", "c++", "c", null, null, null] 
    
*/

 

70+ SQL courses for beginners and professionals