How to combine array of boolean functions into a single boolean function?

Question

I have many arrays of functions of variable length in which each function in an array takes a single argument of the same type and returns true or false.

How can I "compose" these functions together into a single function that tests that each and every component function returns true?

var less_than = function(y) {
    function(x) {
    return x < y;
  }
}

var greater_than = function(y) {
    function(x) {
    return x > y;
  }
}

var is_even = function(x) {
    return x % 2 == 0;
}

var fns = [less_than(10), greater_than(1), is_even];

var test_function = combine_tests(fns);
test_function(8) // => true

Gavriel · Accepted Answer · 2016-02-05 08:45:15Z

5

The every() method tests whether all elements in the array pass the test implemented by the provided function.

var functions = [f1, f2, f3];
var arg = "foo";
var result = functions.every(function(func){
    return func(arg);
});

edited Feb 5, 2016 at 8:45

answered Feb 5, 2016 at 8:36

Gavriel

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