RefEquals - Revision history

Marc Gurevitx: /* Example */

2023-11-17T08:13:37Z

Example

Marc Gurevitx: On immutable types

2023-11-11T20:10:18Z

On immutable types

JoeStrout: Created page with "The refEquals function checks two values for reference equality. This is different from the == operator, which checks whether two values are ''equivalent'' (e.g..."

2023-11-09T22:54:50Z

Created page with "The <c>refEquals</c> function checks two values for reference equality. This is different from the <c>==</c> operator, which checks whether two values are ''equivalent'' (e.g..."

New page

The <c>refEquals</c> function checks two values for reference equality. This is different from the <c>==</c> operator, which checks whether two values are ''equivalent'' (e.g., two maps that contain equal key/value pairs, or two lists which contain equal values).

Whenever <c>refEquals(a, b)</c> is true (1), then you know that any modification of <c>a</c> will also be seen via <c>b</c>, because <c>a</c> and <c>b</c> refer to the same object.

=== Arguments ===

{| class="wikitable"
|-
! Parameter Name !! Default Value !! Meaning
|-
| ''a'' || any value|| first argument
|-
| ''b'' || any value || second argument
|}

== Example ==

<ms>a = {"foo":42}
b = a
c = {"foo":42}
print a == b // prints 1, because a and b have the same value
print a == c // prints 1, because a and c have the same value
print refEquals(a,b) // prints 1, as these are the same map
print refEquals(a,c) // prints 0, as these are different maps
</ms>

[[Category:Intrinsic Functions]]
[[Category:Numeric Functions]]

← Older revision		Revision as of 20:10, 11 November 2023
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	Whenever <c>refEquals(a, b)</c> is true (1), then you know that any modification of <c>a</c> will also be seen via <c>b</c>, because <c>a</c> and <c>b</c> refer to the same object.		Whenever <c>refEquals(a, b)</c> is true (1), then you know that any modification of <c>a</c> will also be seen via <c>b</c>, because <c>a</c> and <c>b</c> refer to the same object.
		+
		+	For immutable types – <c>null</c>s, <c>number</c>s and <c>string</c>'s – <c>refEquals</c> returns the same result as the <c>==</c> operator.

	=== Arguments ===		=== Arguments ===

@@ Line 26: / Line 26: @@
 print refEquals(a,b)  // prints 1, as these are the same map
 print refEquals(a,c)  // prints 0, as these are different maps
 </ms>
 [[Category:Intrinsic Functions]]
 [[Category:Numeric Functions]]