Nashorn: Comparing BigDecimal and number with strict equality

When working with Oracle's JDK 1.8.0_121 and using Nashorn (the JavaScript engine integrated into the JDK), the comparison new BigDecimal(1.0) === 1 returns false, while new BigDecimal(1.0) == 1 returns true:

By utilizing JDK 1.8.0_121's jjs (Nashorn REPL):

jjs> var BigDecimal = Java.type("java.math.BigDecimal")
jjs> var bd = new BigDecimal(1.0)
jjs> bd
1
jjs> bd === 1.0
false
jjs> bd == 1.0
true

When using JDK 1.8.0_74's jjs:

jjs> var BigDecimal = Java.type("java.math.BigDecimal")
jjs> var bd = new BigDecimal(1.0)
jjs> bd
1
jjs> bd === 1.0
true
jjs> bd == 1.0
true

Is this change in strictness rules for equality in Nashorn documented? Is there a specific definition of the === strict equality operator in Nashorn that could explain this behavior change?

Alternatively, could this be a flaw in the JDK?

javascriptjavanashorn

Answer №1

In JDK 1.8.0_101 and beyond, there was a deliberate modification made, which is detailed in JDK-8143896. The specific handling of strict equality has been intentionally adjusted, as evidenced by a test scenario involving the comparison of BigDecimal to an integer.

Although not explicitly mentioned in the JDK release documentation, this change in behavior is indeed a deliberate one.

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