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Get next true value from a given array index in Julia | Array findnext() Method
• Last Updated : 23 Mar, 2020

The `findnext()` is an inbuilt function in julia which is used to return the next coming index after or including i of a true element of the specified array A, or returns zero if true value is not found. Here values of index or key start from 1 i.e, for index of 1st element is 1, index of 2nd element is 2 and so on.

Syntax:
findnext(A, i)
or
findnext(predicate::Function, A, i)

Parameters:

• A: Specified array
• i: Specified value
• Predicate Function: Determines whether something is true or false based on the specified arguments

Returns: It returns the next coming index after or including i of a true element of the specified array A, or returns zero if true value is not found.

Example 1:

 `# Julia program to illustrate  ` `# the use of Array findnext() method ` ` `  `# Finding index of next true value coming  ` `# after or including index 1 from  ` `# the 1D array A ` `A ``=` `[false, true, true, false] ` `println(findnext(A, ``1``)) ` ` `  `# Finding index of next true value coming  ` `# after or including index (1, 1) from ` `# the 2D array B of size 2 * 2 ` `B ``=` `[false false; true false] ` `println(findnext(B, CartesianIndex(``1``, ``1``))) ` ` `  `# Finding index of next true value coming  ` `# after or including index (1, 2, 1) from ` `# the 3D array C of size 2 * 2*2 ` `C ``=` `cat([false false; true false],  ` `        ``[false true; true false], ` `        ``[true false; true true], dims ``=` `3``) ` `println(findnext(C, CartesianIndex(``1``, ``2``, ``1``))) `

Output: Example 2:

 `# Julia program to illustrate  ` `# the use of Array findnext() method ` ` `  `# Finding index of next even value coming  ` `# after or including index 1 from  ` `# the 1D array A ` `A ``=` `[``1``, ``2``, ``5``, ``6``] ` `println(findnext(iseven, A, ``1``)) ` ` `  `# Finding index of next even value coming  ` `# after or including index (1, 1) from  ` `# the 2D array B of size 2 * 2 ` `B ``=` `[``3` `5``; ``6` `7``] ` `println(findnext(iseven, B, CartesianIndex(``1``, ``1``))) ` ` `  `# Finding index of next even value coming  ` `# after or including index (1, 2, 1) from  ` `# 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(findnext(iseven, C, CartesianIndex(``1``, ``2``, ``1``))) `

Output: My Personal Notes arrow_drop_up
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