Javascript Check If String Exists In Array

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Javascript Check If String Exists In Array

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How To Check If Key Exists In JavaScript Object Sabe io

1 Answer Sorted by 0 html DOCTYPE html head head body script var arr 3bktzgo4 2ltold4k l4u93l4r function check var productNumber document getElementById productNumberId value console log productNumber if arr indexOf productNumber 1 return alert congratulations Product code found You can use the includes method in JavaScript to check if an item exists in an array You can also use it to check if a substring exists within a string It returns true if the item is found in the array string and false if the item doesn t exist

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