hasPrefix

Examine if array starts with a prefix.

Similar: randomPrefix, prefixes, hasPrefix.
Similar: hasValue, hasPrefix, hasInfix, hasSuffix, hasSubsequence, hasPermutation, hasPath.

function hasPrefix(x, y, fc, fm)
// x:  an array
// y:  search prefix
// fc: compare function (a, b)
// fm: map function (v, i, x)

const xarray = require('extra-array');

var x = [1, 2, 3, 4];
xarray.hasPrefix(x, [1, 2]);
// → true

xarray.hasPrefix(x, [-1, -2]);
// → false

xarray.hasPrefix(x, [-1, -2], (a, b) => Math.abs(a) - Math.abs(b));
// → true

xarray.hasPrefix(x, [-1, -2], null, v => Math.abs(v));
// → true

References

• Data.List.isPrefixOf() : Haskell
• List-Extra.isPrefixOf() : Elm
• String.prototype.startsWith() : MDN Web Docs
• iterable-starts-with : @oprogramador