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LibJS: Add Math.exp()

This commit is contained in:
Linus Groh 2020-05-18 15:11:15 +01:00 committed by Andreas Kling
parent b27834cf16
commit e375766f98
5 changed files with 48 additions and 12 deletions

View file

@ -50,6 +50,7 @@ MathObject::MathObject()
put_native_function("cos", cos, 1, attr); put_native_function("cos", cos, 1, attr);
put_native_function("tan", tan, 1, attr); put_native_function("tan", tan, 1, attr);
put_native_function("pow", pow, 2, attr); put_native_function("pow", pow, 2, attr);
put_native_function("exp", exp, 1, attr);
put_native_function("sign", sign, 1, attr); put_native_function("sign", sign, 1, attr);
put("E", Value(M_E), 0); put("E", Value(M_E), 0);
@ -204,7 +205,17 @@ Value MathObject::tan(Interpreter& interpreter)
Value MathObject::pow(Interpreter& interpreter) Value MathObject::pow(Interpreter& interpreter)
{ {
return exp(interpreter, interpreter.argument(0), interpreter.argument(1)); return JS::exp(interpreter, interpreter.argument(0), interpreter.argument(1));
}
Value MathObject::exp(Interpreter& interpreter)
{
auto number = interpreter.argument(0).to_number(interpreter);
if (interpreter.exception())
return {};
if (number.is_nan())
return js_nan();
return Value(::pow(M_E, number.as_double()));
} }
Value MathObject::sign(Interpreter& interpreter) Value MathObject::sign(Interpreter& interpreter)

View file

@ -51,6 +51,7 @@ private:
static Value cos(Interpreter&); static Value cos(Interpreter&);
static Value tan(Interpreter&); static Value tan(Interpreter&);
static Value pow(Interpreter&); static Value pow(Interpreter&);
static Value exp(Interpreter&);
static Value sign(Interpreter&); static Value sign(Interpreter&);
}; };

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@ -1,17 +1,14 @@
load("test-common.js"); load("test-common.js");
// Borrowed from LibM/TestMath.cpp :^)
function expectClose(a, b) { assert(Math.abs(a - b) < 0.000001); }
try { try {
expectClose(Math.E, 2.718281); assert(isClose(Math.E, 2.718281));
expectClose(Math.LN2, 0.693147); assert(isClose(Math.LN2, 0.693147));
expectClose(Math.LN10, 2.302585); assert(isClose(Math.LN10, 2.302585));
expectClose(Math.LOG2E, 1.442695); assert(isClose(Math.LOG2E, 1.442695));
expectClose(Math.LOG10E, 0.434294); assert(isClose(Math.LOG10E, 0.434294));
expectClose(Math.PI, 3.1415926); assert(isClose(Math.PI, 3.1415926));
expectClose(Math.SQRT1_2, 0.707106); assert(isClose(Math.SQRT1_2, 0.707106));
expectClose(Math.SQRT2, 1.414213); assert(isClose(Math.SQRT2, 1.414213));
console.log("PASS"); console.log("PASS");
} catch (e) { } catch (e) {

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@ -0,0 +1,19 @@
load("test-common.js");
try {
assert(Math.exp.length === 1);
assert(Math.exp(0) === 1);
assert(isClose(Math.exp(-2), 0.135335));
assert(isClose(Math.exp(-1), 0.367879));
assert(isClose(Math.exp(1), 2.718281));
assert(isClose(Math.exp(2), 7.389056));
assert(isNaN(Math.exp()));
assert(isNaN(Math.exp(undefined)));
assert(isNaN(Math.exp("foo")));
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}

View file

@ -50,3 +50,11 @@ function assertThrowsError(testFunction, options) {
} }
} }
/**
* Check whether the difference between two numbers is less than 0.000001.
* @param {Number} a First number
* @param {Number} b Second number
*/
function isClose(a, b) {
return Math.abs(a - b) < 0.000001;
}