How to convert a number into range of array in javascript

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number = 5
{[...Array(this.props.pages+1)].map((x, i) =>
          <h2 key={i} onClick={()=>this.demoMethod(i+1)} className="tc">{ i+1 }</h2>
//expecting result: [1,2,3,4,5]

How to convert number to array of range of that number.

This is what probably you want.

const number = 5;

const result = new Array(number).fill(true).map((e, i) => i+1);

console.log(result); // Consoles  [1,2,3,4,5]

In your case you are missing fill part.

Use [...Array(this.props.pages+1)].fill(true).map(...)

How to reduce consecutive integers in an array to hyphenated range , In JavaScript, how can I convert a sequence of numbers in an array to a function ranges(numbers){ var sorted = numbers.sort(function(a,b){return a-b;}) I've written my own method that's dependent on Lo-Dash, but doesn't just give you back an array of ranges, An adaptation of CMS's javascript solution for Cold Fusion. How to convert Map keys to an array in JavaScript ? How to convert a DOM nodelist to an array using JavaScript ? Convert an Array to an Object in JavaScript; How to convert Object's array to an array using JavaScript ? How to convert arguments object into an array in JavaScript ? How to convert an Object {} to an Array [] of key-value pairs in

Why not just create a loop to do what you need. As long as you have the number:

    const number = 5;
    const numberArray = [];
    for(let i = 1; i <= number; i++){

JavaScript Range: How to create range in Javascript, We could also make use of Array.from to create range: a forof loop (which would be very efficient) or use an array spread to retrieve all values (note that this essentially (line break for readability on And if you don't like the arrow function, then it's easy to convert to a standard es5 style function. In this javascript split method tutorial, you have learned how to convert comma-separated strings into an array in javascript using the split method. Also, you have learned different technic for convert string into an array in javascript.

ES6 Solution:

new Array(5).fill(undefined).map((v,i) => i+1);

Javascript Array to Object: How to convert an array into an object in , , and create a unique property for each item based on the key we have passed in. Converting Strings to Numbers. The global method Number() can convert strings to numbers. Strings containing numbers (like "3.14") convert to numbers (like 3.14). Empty strings convert to 0. Anything else converts to NaN (Not a Number).

Use the Array.prototype.keys function to get the iterator of indexes of the generated array. Using the ... spread operator convert the iterator into an array of numbers till the specified range.


The keys() method returns a new Array Iterator object that contains the keys for each index in the array.

Array.prototype.range = (n) => {
 return [ Array(n+1).keys()].slice(1, n+1);

Array.from(), How do you return an array from a function in JavaScript? An array-like or iterable object to convert to an array. mapFn Optional Map function to call on every element of the array. thisArg Optional Value to use as this when executing mapFn. Return value. A new Array instance. Description. Array.from() lets you create Arrays from: array-like objects (objects with a length property and indexed elements

Array Number Ranges in JavaScript ES6, is a function that basically takes in a starting index and ending index then return a list of all integers from start to end. The most obvious way would be using a for loop. How to convert an Object {} to an Array [] of key-value pairs in JavaScript? The task is to convert an Object {} to an Array [] of key-value pairs using JavaScript. Introduction: Objects, in JavaScript, is it’s most important data-type and forms the building blocks for modern JavaScript.

HTML and JavaScript BASICS, arrayLike: An array-like or iterable object to convert to an array. since the intermediate array would necessarily have values truncated to fit into Sequence generator function (commonly referred to as "range", e.g. Clojure,  The Number() function converts the object argument to a number that represents the object's value. If the value cannot be converted to a legal number, NaN is returned. Note: If the parameter is a Date object, the Number() function returns the number of milliseconds since midnight January 1, 1970 UTC.

Chapter 18. Arrays, If you see yourself programming JavaScript at any point, it's really worth it to learn the new features, which (although complex at first glance) really  Convert String to Array with JavaScript's split Method JavaScript's string split method returns an array of substrings obtained by splitting a string on a separator you specify. The separator can be a string or regular expression. Invoke the split method on the string you want to split into array elements.

  • Possible duplicate of Does JavaScript have a method like "range()" to generate a range within the supplied bounds?
  • Alternatively, Array.from({length: number}, (_, i) => i + 1).