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I am learning Javascript and don’t understand why the indexOf below returns -1:
var string = "The quick brown fox jumps over the lazy dog";
console.log (string.indexOf("good"));
-1 means “no match found”.
The reason it returns -1 instead of “false” is that a needle at the beginning of the string would be at position 0, which is equivalent to false in Javascript. So returning -1 ensures that you know there is not actually a match.