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Boolean Operators

The or and and operators take two parameters and return a boolean result.
not flips a boolean from true to false, or vice versa.
any will return true if there are any true values in a array sequence, and all will return true if all elements in an array are true.
any_c(condition) and all_c(condition) are like any and all but they take a condition expression that is used against each element to determine if it's true. Note: in jq you can simply pass a condition to any or all and it simply works - yq isn't that clever..yet
These are most commonly used with the select operator to filter particular nodes.
  • equals / not equals (==, !=) operators here
  • comparison (>=, < etc) operators here
  • select operator here

or example

Running
yq --null-input 'true or false'
will output
true

and example

Running
yq --null-input 'true and false'
will output
false

Matching nodes with select, equals and or

Given a sample.yml file of:
- a: bird
b: dog
- a: frog
b: bird
- a: cat
b: fly
then
yq '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
will output
- a: bird
b: dog
- a: cat
b: fly

any returns true if any boolean in a given array is true

Given a sample.yml file of:
- false
- true
then
yq 'any' sample.yml
will output
true

any returns false for an empty array

Given a sample.yml file of:
[]
then
yq 'any' sample.yml
will output
false

any_c returns true if any element in the array is true for the given condition.

Given a sample.yml file of:
a:
- rad
- awesome
b:
- meh
- whatever
then
yq '.[] |= any_c(. == "awesome")' sample.yml
will output
a: true
b: false

all returns true if all booleans in a given array are true

Given a sample.yml file of:
- true
- true
then
yq 'all' sample.yml
will output
true

all returns true for an empty array

Given a sample.yml file of:
[]
then
yq 'all' sample.yml
will output
true

all_c returns true if all elements in the array are true for the given condition.

Given a sample.yml file of:
a:
- rad
- awesome
b:
- meh
- 12
then
yq '.[] |= all_c(tag == "!!str")' sample.yml
will output
a: true
b: false

Not true is false

Running
yq --null-input 'true | not'
will output
false

Not false is true

Running
yq --null-input 'false | not'
will output
true

String values considered to be true

Running
yq --null-input '"cat" | not'
will output
false

Empty string value considered to be true

Running
yq --null-input '"" | not'
will output
false

Numbers are considered to be true

Running
yq --null-input '1 | not'
will output
false

Zero is considered to be true

Running
yq --null-input '0 | not'
will output
false

Null is considered to be false

Running
yq --null-input '~ | not'
will output
true