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JavaScript - create array of all integers between two numbers (inclusive)

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Created by:

Blessing-D

574

In this article, we would like to show you how to create an array of all integers between two numbers in JavaScript.

Quick solution:

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var array = [];
​
var startNumber = 1;
var endNumber = 3;
​
for (var i = startNumber; i <= endNumber; ++i) {
    array.push(i);
}
​
console.log(array); // [ 1, 2, 3 ]

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Note:

The startNumber can't be higher than endNumer and they both have to be integers.

Reusable arrow function (ES6+)

Edit

In this example, we create a reusable arrow function that creates array of all integers between start and end numbers. In this solution, the start number can be higher than the end number.

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const createArray = (start, end) => {
    const array = [];
    if (end > start) {
        for (let i = start; i <= end; ++i) {
            array.push(i);
        }
    } else {
        for (let i = start; i >= end; --i) {
            array.push(i);
        }
    }
    return array;
};
​
​
// Usage example:
​
const array1 = createArray(0, 2);
const array2 = createArray(2, 4);
const array3 = createArray(2, 0);
​
console.log(array1); // [ 0, 1, 2 ]
console.log(array2); // [ 2, 3, 4 ]
console.log(array3); // [ 2, 1, 0 ]