Nodejs Array Zip zip( fn, array )

Method Source Code

Array.prototype.zip = function( fn, array ) {
    var ret = [];
    for ( var i = 0; i < this.length; ++i ) {
        ret.push( fn( this[ i ], array[ i ] ) );
    }//from  ww w .  j  a v a  2s  .c om

    return ret;
};

Array.cons = function( head, tail ) {
    b = [ head ];
    b.push.apply( b, tail );
    return b;
};

Array.head = function( array ) {
    return array[ 0 ];
};

Array.tail = function( array ) {
    var ret = [];
    for ( var i = 1; i < array.length; ++i ) {
        ret.push( array[ i ] );
    }

    return ret;
};

Array.prototype.head = function() {
    return Array.head( this );
};

Array.prototype.tail = function() {
    return Array.tail( this );
};

Array.prototype.sum = function() {
    return this.reduce( function( total, x ) {
        return total + x;
    }, 0 );
};

Related

1. zip()

   Array.prototype.zip = function() {
       return this.map((value, index, arr) => {
           return arr.map((val, idx, array) => {
               return val[index];
           });
       });
   };
   

2. zip(arr, selector)

   Array.prototype.zip = function (arr, selector) {
     return this
     .take(Math.min(this.length, arr.length))
     .select(function (t, i) {
       return selector(t, arr[i]);
     });
   };
   

3. zip(callback)

   Array.prototype.zip = function (callback) {
       callback = callback || function (data) {
           return data;
       return this.map(callback);
   var arr = [4, 9, 16, 25];
   console.log(
       arr.zip(function (data) {
   ...
   

4. zip(callback)

   Array.prototype.zip = function (callback) {
       callback = callback || function (data) {
           return data;
       return this.map(callback);