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Check if a string contains a substring in JavaScript

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Since ES6 you can now use the built in includes method eg string.includes(substring).

For example

"testing".includes("test");
// true

One thing to note is this is case sensitive so the below will be false.

"Testing".includes("test");
// false

There is also an optional position param which defaults to 0.

For example the below will return true.

"sand".includes("and");
"sand".includes("and", 1);

However this will return false, because we are only including the part of the string after charecter 2 eg nd

"sand".includes("and", 2);

For more information be sure to read about includes on the MDN website.

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