# Check if a specific index of an array contains a value in Julia – isassigned() Method

Last Updated : 26 Mar, 2020

The `isassigned()` is an inbuilt function in julia which is used to test whether the given index contains a value in the specified array or not.

Syntax: isassigned(array, i)

Parameters:

• array: Specified array
• i: Specified index value

Returns: It returns true if the specified index value is present in the array else false.

Example 1:

 `# Julia program to illustrate  ` `# the use of Array isassigned() method ` `  `  `# test whether the given index value 3 is ` `# present in the 1D array A. ` `A ``=` `[``5``, ``10``, ``15``, ``20``] ` `println(isassigned(A, ``3``)) ` `  `  `# test whether the given index value 5 is ` `# present in the 2D array B of size 2 * 2 ` `B ``=` `[``5` `10``; ``15` `20``] ` `println(isassigned(B, ``5``)) ` `  `  `# test whether the given index value 9 is ` `# present in the 3D array C of size 2 * 2*2 ` `C ``=` `cat([``1` `2``; ``3` `4``], [``5` `6``; ``7` `8``],  ` `        ``[``9` `10``; ``11` `12``], dims ``=` `3``) ` `println(isassigned(C, ``9``)) `

Output:

Example 2:

 `# Julia program to illustrate  ` `# the use of Array isassigned() method ` `   `  `# test whether the given index value 3 is ` `# present in the 1D array A. ` `A ``=` `[``1``, ``2``, ``3``]; ` `println(isassigned(A, ``10``)) ` `   `  `# test whether the given index value 5 is ` `# present in the 2D array B of size 3 * 2 ` `B ``=` `[``5` `10``; ``15` `20``; ``25` `30``]; ` `println(isassigned(B, ``25``)) ` `   `  `# test whether the given index value 9 is ` `# present in the 3D array C of size 2 * 2*4 ` `C ``=` `cat([``1` `2``; ``3` `4``], [``5` `6``; ``7` `8``],  ` `        ``[``9` `10``; ``11` `12``], [``13` `14``; ``15` `16``], dims ``=` `3``); ` `println(isassigned(C, ``9``)) `

Output: