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@kentcdodds
Created October 17, 2014 18:02
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starts and ends with mixins
(function() {
'use strict';
_.mixin({
startsWith: function startsWithMixin(s1, s2) {
return startsOrEndsWith(_.first, s1, s2);
},
endsWith: function endsWithMixin(s1, s2) {
return startsOrEndsWith(_.last, s1, s2);
}
});
function startsOrEndsWith(fn, s1, s2) {
return s1 && s2 && s1.length > s2.length && fn(s1, s2.length).join('') === s2;
}
})();
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