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// Copyright 2009 the Sputnik authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/**
* @name: S13.2.1_A5_T2;
* @section: 13.2.1;
* @assertion: Closures are admitted;
* @description: Returning a function that approximates the derivative of f
* using an interval of dx, which should be appropriately small;
*/
// Converted for Test262 from original Sputnik source
ES5Harness.registerTest( {
id: "S13.2.1_A5_T2",
path: "TestCases/13_Function_Definition/13.2_Creating_Function_Objects/S13.2.1_A5_T2.js",
assertion: "Closures are admitted",
description: "Returning a function that approximates the derivative of f",
test: function testcase() {
// Return a function that approximates the derivative of f
// using an interval of dx, which should be appropriately small.
function derivative(f, dx) {
return function(x) {
return (f(x + dx) - f(x)) / dx;
};
}
//////////////////////////////////////////////////////////////////////////////
//CHECK#1
if (Math.abs(derivative(Math.sin, 0.0001)(0) - derivative(Math.sin, 0.0001)(2*Math.PI)) >= 1/65536.0) {
$ERROR('#1: Math.abs(derivative(Math.sin, 0.0001)(0) - derivative(Math.sin, 0.0001)(2*Math.PI)) <= 1/65536.0');
}
//
//////////////////////////////////////////////////////////////////////////////
}
});
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