JavaScript Strings Find the index of a substring inside a string
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Example
The .indexOf method returns the index of a substring inside another string (if exists, or -1 if otherwise)
'Hellow World'.indexOf('Wor'); // 7
.indexOf also accepts an additional numeric argument that indicates on what index should the function start looking
"harr dee harr dee harr".indexOf("dee", 10); // 14
You should note that .indexOf is case sensitive
'Hellow World'.indexOf('WOR'); // -1
