JavaScript: Fill an array with values on supplied bounds

JavaScript Array: Exercise-29 with Solution

Fill Array with Values

Write a JavaScript function to fill an array with values (numeric, string with one character) within supplied bounds.

Test Data:
console.log(num_string_range('a', "z", 2));
["a", "c", "e", "g", "i", "k", "m", "o", "q", "s", "u", "w", "y"]

Sample Solution:

JavaScript Code:

// Function to generate a range of numbers or characters based on start, end, and step
function num_string_range(start, end, step) {
 // Initialize an empty array 'range' to store the generated range
 var range = [];
 // Check for invalid step value or undefined start/end values
 if ((step === 0) || (typeof start === "undefined" || typeof end === "undefined") || (typeof start !== typeof end))
 return false;
 // Adjust the step direction if end is less than start
 if (end < start) { step = -step; } // Check if the start value is a number if (typeof start === "number") { // Generate a range of numbers while (step> 0 ? end>= start : end <= start) { range.push(start); start += step; } } // Check if the start value is a string else if (typeof start === "string") { // Check if both start and end are single characters if (start.length !== 1 || end.length !== 1) { throw TypeError("Strings with one character are supported."); } // Convert characters to their ASCII codes start = start.charCodeAt(0); end = end.charCodeAt(0); // Generate a range of characters while (step> 0 ? end>= start : end <= start) { range.push(String.fromCharCode(start)); start += step; } } // Throw an error for unsupported types else { throw TypeError("Only string and number are supported"); } // Return the generated range return range; } // Output the result of the num_string_range function with sample inputs console.log(num_string_range('a', "z", 2)); console.log(num_string_range("Z", "A", 2)); console.log(num_string_range(0, -5, 1)); console.log(num_string_range(0, 25, 5)); console.log(num_string_range(20, 5, 5)); 

Output:

["a","c","e","g","i","k","m","o","q","s","u","w","y"]
["Z","X","V","T","R","P","N","L","J","H","F","D","B"]
[0,-1,-2,-3,-4,-5]
[0,5,10,15,20,25]
[20,15,10,5]

Flowchart:

ES6 Version:

// Function to generate a range of numbers or characters based on start, end, and step
const num_string_range = (start, end, step) => {
 // Initialize an empty array 'range' to store the generated range
 const range = [];
 // Check for invalid step value or undefined start/end values
 if ((step === 0) || (typeof start === "undefined" || typeof end === "undefined") || (typeof start !== typeof end))
 return false;
 // Adjust the step direction if end is less than start
 if (end < start) { step = -step; } // Check if the start value is a number if (typeof start === "number") { // Generate a range of numbers while (step> 0 ? end>= start : end <= start) { range.push(start); start += step; } } // Check if the start value is a string else if (typeof start === "string") { // Check if both start and end are single characters if (start.length !== 1 || end.length !== 1) { throw TypeError("Strings with one character are supported."); } // Convert characters to their ASCII codes start = start.charCodeAt(0); end = end.charCodeAt(0); // Generate a range of characters while (step> 0 ? end>= start : end <= start) { range.push(String.fromCharCode(start)); start += step; } } // Throw an error for unsupported types else { throw TypeError("Only string and number are supported"); } // Return the generated range return range; }; // Output the result of the num_string_range function with sample inputs console.log(num_string_range('a', "z", 2)); console.log(num_string_range("Z", "A", 2)); console.log(num_string_range(0, -5, 1)); console.log(num_string_range(0, 25, 5)); console.log(num_string_range(20, 5, 5)); 

Live Demo:

See the Pen JavaScript - Fill an array with values on supplied bounds - array-ex- 29 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that creates an array of a specified length filled with a given numeric or string value using a loop.
• Write a JavaScript function that uses Array.from() to generate an array filled with a default value.
• Write a JavaScript function that leverages the fill() method to create a pre-filled array and returns it.
• Write a JavaScript function that validates the provided length and default value before creating the array.

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