Alternative (Default value)

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This operator is used to provide alternative (or default) values when a particular expression is either null or false.
LHS is defined
Given a sample.yml file of:
1
a: bridge
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then
1
yq eval '.a // "hello"' sample.yml
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will output
1
bridge
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LHS is not defined
Given a sample.yml file of:
1
{}
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then
1
yq eval '.a // "hello"' sample.yml
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will output
1
hello
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LHS is null
Given a sample.yml file of:
1
a: ~
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then
1
yq eval '.a // "hello"' sample.yml
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will output
1
hello
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LHS is false
Given a sample.yml file of:
1
a: false
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then
1
yq eval '.a // "hello"' sample.yml
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will output
1
hello
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RHS is an expression
Given a sample.yml file of:
1
a: false
2
b: cat
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then
1
yq eval '.a // .b' sample.yml
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will output
1
cat
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Anchor and Alias Operators

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