Nodejs Array Range range(start,end,step)

Method Source Code

/**//w w  w . j ava 2 s .  c om
 * Created by xiaos on 16/11/24.
 */
Array.prototype.range = (start,end,step)=>{
    const stepVal = step || 1
    const set = new Set()
    for (var i=start;i<=end;i=i+stepVal){
        set.add(i)
    }
    return [...set]
}

Set.prototype.union = function (set) {
    return new Set([...this,...set])
}

Set.prototype.inrs = function (set) {
    let arr = [...this].filter(v=>set.has(v))
    return new Set(arr)
}

Set.prototype.diff = function (set) {
    let arr = [...this].filter(v=>!set.has(v))
    return new Set(arr)
}



module.exports = {
    page(page,count,maxCount,action){
        const maxPage = Math.ceil(maxCount/count)
        const data = {}
        if (page >= maxPage){
            data.last = true
            data.pre =  Math.max(1,maxPage-1)
        }else if (page == 1){
            data.first = true
            data.next =  page + 1
        }else {
            data.pre = page - 1
            data.next = page + 1
        }
        data.action = action
        return data
    }
}

Related

1. range(from, to)

   Array.prototype.range = function(from, to) {
     var i, result = [];
     for (i = from; i<= to; i++) {
       result.push(i);
     return result;
   };
   console.log([].range(1, 10));
   

2. range(start, count)

   Array.range  = function(start, count) {
     var arr = [],
         val = start;
     while(count > 0) {
       arr.push(val);
       count--;
       val++;
     return arr;
   ...
   

3. range(start, end)

   Array.range = function (start, end) {
     var a = [], i;
     for (i = start; i < end; i += 1) {
       a[i] = i;
     return a;
   

4. range(start, end)

   Array.prototype.range = function(start, end) {
       var result = [];
       for (var i = start; i <= end; i++) {
           result.push(i);
       return result;
   

5. range(start,end)

   Array.prototype.range = function(start,end){
     return Array.apply(null, Array(end-start+1)).map(function (_, i){
         return start+i;
     });
   };
   

6. rangeArray(startIndex, endIndex)

   Array.prototype.rangeArray = function (startIndex, endIndex) {
     var arr = []
     for(var i=startIndex; i<endIndex; i++) {
       arr.push(i);
     return arr;