Deleting specific array element from multidimensional array?

Question

I'm having trouble cycling through a multidimensional array and deleting a specific element array. My multidimensional array looks a little like this:

myArray = [["Tom", "161"], ["Dick", "29"], ["Harry", "46"]];

So if I have the number 29. What's the most efficient way to cycle through this array and delete the array element who's second element is 29? i.e. ["Dick", "29"]

Solution 1

var myArray = [["Tom", "161"], ["Dick", "29"], ["Harry", "46"]];
var myNewArray = myArray.filter(function(item){ return item[1] != 29 })  

.filter uses native code to loop over your array. Building a new array could of course be more expensive than just cutting a part out of the old one, to be tested.

Solution 2

myArray = [["Tom", "161"], ["Dick", "29"], ["Harry", "46"]];
for(var i = 0; i <= myArray.length - 1; i++){
    if(myArray[i][1] == "29"){
        myArray[i].splice(0,2);
    }
}
console.log(myArray);

// returns [ [ 'Tom', '161' ], [], [ 'Harry', '46' ] ]

Comments

[aadu]

That works, but you think making a new array is less efficient than the above loop and splice method?

[brbcoding]

This method is substanially faster than mine... jsperf.com/removearrfrommulti