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107

forEach() and Apply() methods for two dimensional array in JavaScript

rated 0 times [ 113] [ 6] / answers: 1 / hits: 23988 / 9 Years ago, tue, january 12, 2016, 12:00:00

I have an array whose elements are also arrays, each containing three elements. I want to call the function calcMe(a,b,c){...} for each of the elements of my main array using forEach() method, but I got really confused and don't know how to get it to work.

arr = [[1,5,4], [8,5,4], [3,4,5], [1,2,3]]

function calcMe(a,b,c){...}

arr.forEach(calcMe.Apply(-----, -----));

How do I pass each of the inner array's elements as arguments to my function using Apply()?

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johnnaj

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answered 9 Years ago martina · Accepted Answer

First, calcMe doesn't seem to return a function, so you can't pass its return value to forEach.

I'm guessing you want something like

var arr = [

  [1, 5, 4],

  [8, 5, 4],

  [3, 4, 5],

  [1, 2, 3]

]



function calcMe(a, b, c) {

  var pre = document.getElementById('pre')

  pre.innerHTML += 'calcMe arguments: ' +  a +,+ b +,+ c  + <br/>;

}



arr.forEach(function(el, index) {

  // Could also use `arr[index]` instead of el

  calcMe.apply(this, el);

});

<pre id='pre'></pre>

For a fancier version, you can bind Function.prototype.apply to emulate creating a function like I did above.