How I can iterate over an array and pass items to

问题:

I want to call a request method that gets the body of itself as an array that is also one item of another array. so I should iterate over this parent array and pass its items to request method for a new request to server. I have used bodies.forEach but this make the calls async and I should also do something after every response and need sync calls. What is the best way to do this?

bodies = [ [['name', 'Saeid'], ['age','23']],
           [['name', 'Saeid'], ['age', 23 ], ['city', 'Tehran']]
          ]
bodies.forEach(function(body){
  request(body, function(res){
    //do something with this response and if meet oure desired condition continue...
    )};
 });

回答1:

You could use Array.prototype.slice(), Array.prototype.shift() to return results in sequential order corresponding to input array

bodies = [ [['name', 'Saeid'], ['age','23']],
           [['name', 'Saeid'], ['age', 23 ], ['city', 'Tehran']]
          ];

var copy = bodies.slice(0);
var results = [];

function queue(arr) { 
  let curr = arr.shift();
  request(curr, (res) => {
    // do stuff with `res`
    // results.push(res);
    if (arr.length /* && if meet oure desired condition continue... */) {
      queue(arr)
    }
  })
}

queue(copy);