# Counting number of elements in an array in Julia – count() Method

The `count()` is an inbuilt function in julia which is used to count the number of elements in the specified array for which the given predicate p returns true and if p is omitted, counts the number of true elements in the given collection of boolean values.

Syntax:
count(p, itr)
or
count(itr)

Parameters:

• p: Specified set of instructions.
• itr: Specified collection of boolean values.

Returns: It returns the count of the number of elements in the specified array for which the given predicate p returns true and if p is omitted, counts the number of true elements in the given collection of boolean values.

Example 1:

 `# Julia program to illustrate  ` `# the use of count() method ` ` `  `# Getting the count of the number ` `# of elements in the specified array ` `# for which the given predicate p  ` `# returns true. ` `println(count(i``-``>(i<``=` `3``), [``1``, ``2``, ``3``, ``4``, ``5``])) ` `println(count(i``-``>(i>``3``), [``1``, ``2``, ``3``, ``4``, ``5``])) ` `println(count(i``-``>(``2``<``=` `i<``=` `5``), [``1``, ``2``, ``3``, ``4``, ``5``])) ` `println(count(i``-``>(i>``=` `0``), [``1``, ``2``, ``3``])) `

Output:

```3
2
4
3
```

Example 2:

 `# Julia program to illustrate  ` `# the use of count() method ` ` `  `# Getting the counts of number of true elements ` `# in the given collection of boolean values. ` `println(count([false, false, false])) ` `println(count([true, false, true])) ` `println(count([true, true, true])) `

Output:

```0
2
3
```
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