Function TestHigherOrder

deps/v8/test/mjsunit/es6/proxies-function.js:450–455

(f)

// Passing a proxy function to higher-order library functions.

function TestHigherOrder(f) {
  assertEquals(6, [6, 2].map(f)[0])
  assertEquals(4, [5, 2].reduce(f, 4))
  assertTrue([1, 2].some(f))
  assertEquals("a.b.c", "a.b.c".replace(".", f))
}

TestHigherOrder(function(x) { return x })
TestHigherOrder(function(x) { "use strict"; return x })