Groovy - Map every(Closure predicate) method

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Description

Groovy Map every(Closure predicate) method iterates over each entry of the map and checks if predicates is valid for each entry.

Syntax

public boolean every(Closure predicate)

Parameters

predicate − 1 or 2 arguments closure used for matching

Return Value

true if all entries are valid for the closure

Example - Checking Maps of String and String

Following is an example of the usage of this method −

main.groovy

// define a map
def map = ["A" : "Apple", "B" : "Banana", "C": "Carrot"] 

// check if all values are string
def result = map.every{entry -> entry.value instanceof String}

println(result)

// check if all values are string
result = map.every{key, value -> value instanceof String}

println(result)

Output

When we run the above program, we will get the following result −

true
true

Example - Checking Maps of Integer and Floats

Following is an example of the usage of this method −

main.groovy

// define maps
def map = [1 : 11, 2 : 12, 3: 13]

// check if all values are number
def result = map.every{entry -> entry.value instanceof Number}

println(result)

// check if all values are Integer
result = map.every{key, value -> value instanceof Integer}

println(result)

Output

When we run the above program, we will get the following result −

true
true

Example - Checking Maps of String and Object

Following is an example of the usage of this method −

main.groovy

// define maps
def map = [1 : new Student(1, "Julie"), 2 : new Student(2, "Robert"), 3: new Student(3,"Adam")] 

// check if all values are Students
def result = map.every{entry -> entry.value instanceof Student}

println(result)

// check if all values are Student
result = map.every{key, value -> value instanceof Student}

println(result)

class Student{
   int rollNo
   String name

   Student(int rollNo, String name){
      this.rollNo = rollNo
      this.name = name
   }

   @Override
   public boolean equals(Object obj) {
      Student s = (Student)obj
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name)
   }
   
   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]"
   }
}

Output

When we run the above program, we will get the following result −

true
true