Question

How to create an array containing a range of characters in TypeScript

Answer 1

function createCharRangeArray(startChar: string, endChar: string): string[] {
    let charArray: string[] = [];
     
    for (let i = startChar.charCodeAt(0); i <= endChar.charCodeAt(0); i++) {
        charArray.push(String.fromCharCode(i));
    }
     
    return charArray;
}

let charRange: string[] = createCharRangeArray('c', 'i');

console.log(charRange);
 
  
        
/*
run:
        
["c", "d", "e", "f", "g", "h", "i"] 
        
*/

 

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Answer 2

function createCharRangeArray(startChar: string, endChar: string): string[] {
    let start: number = startChar.charCodeAt(0);
    let end : number= endChar.charCodeAt(0);
     
    return Array.from({ length: end - start + 1 }, (_, i) => String.fromCharCode(start + i));
}

let charRange: string[] = createCharRangeArray('c', 'i');

console.log(charRange);
 
  
        
/*
run:
        
["c", "d", "e", "f", "g", "h", "i"] 
        
*/
  

 

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Answer 3

function createCharRangeArray(startChar: string, endChar: string): string[] {
    let start: number = startChar.charCodeAt(0);
    let end : number= endChar.charCodeAt(0);
     
    return [...Array(end - start + 1).keys()].map(i => String.fromCharCode(start + i));
}

let charRange: string[] = createCharRangeArray('c', 'i');

console.log(charRange);
 
  
        
/*
run:
        
["c", "d", "e", "f", "g", "h", "i"] 
        
*/

 

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