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I have to use includes or indexof in place of in, does it effect the application. Below is the code 

if (replacementKey in this.replacementParts){
--conditional statememnts
}
jitender
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Ram
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    why do you need to find index and check if it's -1.Simply use includes – jitender Jan 23 '20 at 05:31
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    You might want to look at this already asked question:https://stackoverflow.com/questions/35370222/array-prototype-includes-vs-array-prototype-indexof I hope this answers to your query. – Hope Jan 23 '20 at 05:47

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