feat: use Math for double::{ln,log2,log10} on JS

Author: tonyfettes

double/log_js.mbt

@@ -0,0 +1,81 @@
+// Copyright 2025 International Digital Economy Academy
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+///|
+/// Calculates the natural logarithm of a double-precision floating-point number.
+///
+/// Parameters:
+///
+/// * `self`: The input number.
+///
+/// Returns the natural logarithm of the input number, with the following special
+/// cases:
+///
+/// * Returns NaN if the input is NaN or negative
+/// * Returns negative infinity if the input is zero
+/// * Returns the input if it is positive infinity
+///
+/// Example:
+///
+/// ```moonbit
+/// test "ln" {
+///   inspect!(2.0.ln(), content="0.6931471805599453")
+///   inspect!(1.0.ln(), content="0")
+///   inspect!((-1.0).ln(), content="NaN")
+///   inspect!(0.0.ln(), content="-Infinity")
+/// }
+/// ```
+pub fn ln(self : Double) -> Double = "Math" "log"
+
+///|
+/// Calculates the base-2 logarithm of a double-precision floating-point number.
+///
+/// Parameters:
+///
+/// * `x` : A double-precision floating-point number.
+///
+/// Returns the base-2 logarithm of the input number.
+///
+/// Example:
+///
+/// ```moonbit
+/// test "log2" {
+///   inspect!(2.0.log2(), content="1")
+///   inspect!(0.5.log2(), content="-1")
+///   inspect!(3.0.log2(), content="1.584962500721156")
+/// }
+/// ```
+pub fn log2(self : Double) -> Double = "Math" "log2"
+
+///|
+/// Calculates the base-10 logarithm of a double-precision floating-point number.
+///
+/// Parameters:
+///
+/// * `self` : The double-precision floating-point number to calculate the
+/// logarithm of.
+///
+/// Returns a double-precision floating-point number representing the base-10
+/// logarithm of the input.
+///
+/// Example:
+///
+/// ```moonbit
+/// test "log10" {
+///   inspect!(1.0.log10(), content="0")
+///   inspect!(10.0.log10(), content="1")
+///   inspect!(100.0.log10(), content="2")
+/// }
+/// ```
+pub fn log10(self : Double) -> Double = "Math" "log10"

double/log.mbt renamed to double/log_nonjs.mbt

@@ -0,0 +1,40 @@
+// Copyright 2025 International Digital Economy Academy
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+test "log2 log10" {
+  // log2
+  inspect!(3.0.log2(), content="1.584962500721156")
+  inspect!(2.0.log2(), content="1")
+  inspect!(1.0.log2(), content="0")
+  inspect!(0.5.log2(), content="-1")
+  inspect!(0.25.log2(), content="-2")
+  inspect!(0.1.log2(), content="-3.321928094887362")
+
+  // log10
+  inspect!(0.2.log10(), content="-0.6989700043360187")
+  inspect!(15.0.log10(), content="1.1760912590556813")
+}
+
+test "ln" {
+  inspect!(not_a_number.ln(), content="NaN")
+  inspect!(infinity.ln(), content="Infinity")
+  inspect!(neg_infinity.ln(), content="NaN")
+  inspect!((-1.0).ln(), content="NaN")
+  inspect!(0.0.ln(), content="-Infinity")
+  inspect!((-0.0).ln(), content="-Infinity")
+  inspect!(50.0.ln(), content="3.912023005428146")
+  inspect!(2.0.ln(), content="0.6931471805599453")
+  inspect!(1.1125369292536007e-308.ln(), content="-709.0895657128241")
+  inspect!(5.562684646268003e-309.ln(), content="-709.782712893384")
+}

double/log_test.mbt

@@ -8,6 +8,8 @@
   "targets": {
     "exp_js.mbt": ["js"],
     "exp_nonjs.mbt": ["not", "js"],
+    "log_js.mbt": ["js"],
+    "log_nonjs.mbt": ["not", "js"],
     "mod_js.mbt": ["js"],
     "mod_nonjs.mbt": ["not", "js"],
     "pow_js.mbt": ["js"],