Javascript Utils

util.js

//[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] => [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12], [13, 14, 15], [16, 17]]
function grouped(arr, limit){
 return arr.map((data, index) => {
   return index % limit === 0 ? arr.slice(index, index + limit) : null; 
 }).filter((item) => { return item; })
}

//range crete [0,1,2,3,4...number]
function range(number){
 return Array.from(new Array(number), (x,i) => i)
}

//random int 
function randomInt(min, max) {
 return Math.floor(Math.random() * (max - min)) + min;
}


/* Upsert Array of object*/
const upsertArray = (arr, predicate, value) => {
 
    const indexed = arr.map((data, index) => {
        return {...data, ...{index}};
    });
 
    const filtered = indexed.filter(predicate);
    if(filtered.length){
        let index = filtered[0].index;
        arr[index] = value;
        return arr;
    }else {
        return [...arr, ...[value]];
    }
};

let j = [{id: 1, value: "Bangladesh"}, {id: 2, value: "Australia"}];

const predicate = d => d.id === 2;

const k = upsertArray(j, predicate, {id: 2, value: "Aus"});

console.log(k); //[{id: 1, value: "Bangladesh"}, {id: 2, value: "Aus"}];

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