Find all combinations of options in a loop

Question

I\'m looking for the best way to loop through a bunch of options to make sure that I hit all available options.

I\'ve created a feature that allows a client to build

Answer 1

Maybe it's a late answer. But I find a different solution at geeksforgeeks. So anyone can try this.

const hats   = ['fez','fedora'];
const shirts = ['t-shirt','long'];
const pants  = ['shorts','jeans'];
const shoes  = ['sneaker','loafer'];

const data = [hats, shirts, pants, shoes];
const keys = ['hats', 'shirts', 'pants', 'shoes'];


function combination(data, keys) {
    const { length: numberOfArrays } = data;
    
    /**
     * Initialize a variable called indices
     * with the length of data array and
     * fill with zeros.
     */
    const indices = Array(numberOfArrays).fill(0);
    const result = [];

    while (true) {
        let obj = {};

        /**
         * Get the values from the inner arrays
         * with help of `indices` and make an object
         */
        for (let i = 0; i < numberOfArrays; i++) {
            obj[keys[i]] = data[i][indices[i]];
        }
        
        // Push the object into the result array
        result.push(obj);

        // Get the last array
        let pick = numberOfArrays - 1;
        
        /**
         * find the rightmost array that has more 
         * elements left after the current element  
         * in that array
         */
        while (pick >= 0 && (indices[pick] + 1 >= data[pick].length)) {
            pick--;
        }

        /**
         * No such array is found so no more  
         * combinations left 
         */
        if (pick < 0) break;

        /**
         * If found move to next element in that array
         */
        indices[pick]++;

        /**
         * for all arrays to the right of this  
         * array current index again points to  
         * first element 
         */
        for (let i = pick + 1; i < numberOfArrays; i++) {
            indices[i] = 0;
        }

    }

    return result;
}

console.log(combination(data, keys));

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