JavaScript implict conversion to number

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You can implict convert a string to number using the following operators - , / , * 
let num;

num = '6' - '4'; 
console.log(num); // 2

num = '4' - 2;
console.log(num); // 2

num = '4' * 2;
console.log(num); // 8

num = '4' / 2;
console.log(num); // 2

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