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// General high-order functions
function forEach (action, array) {
for (var i = 0; i < array.length; i++)
action (array[i]);
}
function foldl (combine, base, array) {
for (var i = 0; i < array.length; i++)
base = combine (base, array[i]);
return base
}
function foldr (combine, base, array) {
for (var i = array.length - 1; i >= 0; i--)
base = combine (array[i], base);
return base
}
function map (func, array) {
var result = [];
for (var i = 0; i < array.length; i++)
result.push (func (array[i]));
return result
}
function filter (pred, array) {
var result = []
for (var i = 0; i < array.length; i++)
if (pred (array[i])) result.push (array[i]);
return result
}
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