higher order functions using arrays in javascript

Question

I am trying to create a higher order function in javascript someMathArray(x) { } that returns a function and takes another single argument. I want the function to take an original array, say [1,2,3,4] then apply another function for example, named mult2(a) { return a*2 }(however, I want this to work for any function I pass in. I don't want mult2(a) to be hard coded into the function) and then return an array containing [2,4,6,8]

jcubic · Accepted Answer · 2015-11-05 15:34:57Z

1

Something like this?

function someMathArray(array) {
  return function(fun) {
    return array.map(fun);
  };
}

var fun = someMathArray([1,2,3,4,5]);
var output = fun(function(a) { return a*2; });
document.getElementById('output').innerHTML = JSON.stringify(output);

<div id="output"></div>

or

function someMathArray(array) {
  return array.map.bind(array);
}

var fun = someMathArray([1,2,3,4,5]);
var output = fun(function(a) { return a*2; });
document.getElementById('output').innerHTML = JSON.stringify(output);

<div id="output"></div>

edited Nov 5, 2015 at 15:34

answered Nov 5, 2015 at 15:28

jcubic

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3 Comments

ilikecake1 Over a year ago

Thanks! I was having trouble wrapping my head around how higher order functions work, but your answer helped me understand what they are really doing.

ilikecake1 Over a year ago

How would I handle the case that the array is empty?

jcubic Over a year ago

@ilikecake1 [].map(function(a) { return a*2; }) will return empty array.

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