utils/comparearrays

Compares how given arrays relate to each other. One array can be: same as another array, prefix of another array or completely different. If arrays are different, first index at which they differ is returned. Otherwise, a flag specifying the relation is returned. Flags are negative numbers, so whenever a number >= 0 is returned it means that arrays differ.

compareArrays( [ 0, 2 ], [ 0, 2 ] );		// 'same'
compareArrays( [ 0, 2 ], [ 0, 2, 1 ] );		// 'prefix'
compareArrays( [ 0, 2 ], [ 0 ] );			// 'extension'
compareArrays( [ 0, 2 ], [ 1, 2 ] );		// 0
compareArrays( [ 0, 2 ], [ 0, 1 ] );		// 1

Parameters

a : readonly Array<unknown>

Array that is compared.

b : readonly Array<unknown>

Array to compare with.

Returns

number | ArrayRelation

How array a is related to b.