不想用Javascript打印Array of Array

Question

I have an Array of Array and I just want to print outer Array not inner Array.

For example my array is :-

[
"Stories",
"Tasks",
"In Progress",
"In Review",
"Completed",
[
{
    "divName": "content-container2",
    "content": "us 2345",
    "topPos": 109,
    "leftPos": 150
},
{
    "divName": "content-container3",
    "content": "Description",
    "topPos": 98,
    "leftPos": 382
},
{
    "divName": "content-container4",
    "content": "12212",
    "topPos": 110,
    "leftPos": 644
}
]
]

I just want to show ["Stories", "Tasks", "In Progress", "In Review", "Completed"], nothing else.

Please suggest how to handle this thing in javascript?

Answer 1

While iterating the array , check the type of each item in it like

for (var i =0; i< arr.length; i++) {
        if (typeof arr[i] === "string") {
          console.log(arr[i]);
        }
 }

---

A better approach (inspired from this answer )

for (var i =0; i< arr.length; i++) {
    if( Object.prototype.toString.call( arr[i] ) !== '[object Array]' ) {
       console.log(arr[i]);
}

Answer 2

You can loop through the array and check whether each value is an array or not using JavaScript's instanceof operator .

var array = [],  // This is your array
    result = []; // This is the result array

// Loop through each index within our array
for (var i = 0; i < array.length; i++)
    /* If the value held at the current index ISN'T an array
     * add it to our result array. */
    if (!(array[i] instanceof Array))
        result.push(array[i]);

// Log the result array
console.log(result);

JSFiddle demo .

> ["Stories", "Tasks", "In Progress", "In Review", "Completed"] 

Answer 3

In more modern browsers, this also works:

array.filter(function(item){
  return typeof(item) !== "object";
});

Answer 4

Very simple, with three lines you can filter the array:

// Arr is your Array :)
var result = arr.filter(function(value){
  return typeof value != 'array' && typeof value != 'object';
});

// It shows ["Stories", "Tasks", "In Progress", "In Review", "Completed"]
console.log(result); 

See the jsfiddle: http://jsfiddle.net/j4n99uw8/1/ .

UPDATED : Also you can extends the Array and use in another sides:

Array.prototype.oneDimension = function(){
   return this.filter(function(value){
     return typeof value != 'array' && typeof value != 'object';
   });
};

// In each array you can use it:
console.log( arr.oneDimension() );
console.log( ['9',['9'],['2']].oneDimension() ); // Only contains '9'.

See this jsfiddle: http://jsfiddle.net/j4n99uw8/2/