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add general utility functions for objects - objectValueAtPath and objectHasAtPath #2

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add general utility functions for objects - objectValueAtPath and objectHasAtPath #2

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35 changes: 35 additions & 0 deletions util/object-utilities.libsonnet
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
local objectHasAtPath(obj, path) =
if std.isObject(obj) == false || std.isArray(path) == false || std.length(path) <= 0 then
false
else if std.length(path) == 1 then
std.objectHas(obj, path[0])
else
if !std.objectHas(obj, path[0]) then
true
else
objectHasAtPath(obj[path[0]], path[1:]) tailstrict;

local objectValueAtPath(obj, path, default=null) =
if std.isObject(obj) == false || std.isArray(path) == false || std.length(path) <= 0 then
default
else if std.length(path) == 1 then
if std.objectHas(obj, path[0]) then
obj[path[0]]
else
default
else
if !std.objectHas(obj, path[0]) then
default
else
objectValueAtPath(obj[path[0]], path[1:], default) tailstrict;
{
// looks through the nested fields of an object to see if it exists - path indicates nested structure
objectHasAtPath(obj, path):: {
result: objectHasAtPath(obj, path),
},

// similar to objectHasAtPath, but also returns the value if it exists or a default value
objectValueAtPath(obj, path, default=null):: {
result: objectValueAtPath(obj, path, default),
},
}