Simple Duck Punching Example in Vanilla JavaScript
// Duck Punching in JavaScript | |
const sentence = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?'; | |
const legacyIndexOf = String.prototype.indexOf; | |
// Extending the indexOf functionality to return the last occurence of the searchValue | |
String.prototype.indexOf = function (searchValue, fromIndex, getLastIndexFlag = false) { | |
if (!getLastIndexFlag) { | |
return legacyIndexOf.call(this, searchValue, fromIndex); | |
} else { | |
return legacyIndexOf.call(this.split(' ').reverse().join(' '), searchValue, fromIndex); | |
} | |
} |
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