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TypeScript Default Parameters Function

TypeScript - Default Parameters Function

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Default Parameters -

Function parameters can also be assigned values by default.
A parameter can't be declared as optional and default both at the same time.
Stayed Informed – Learn Angular 2 with TypeScript

For Example as,

let discount = function (price: number, rate: number = 0.40) {
    return price * rate;
}

//CALCULATE DISCOUNT
discount(500); // Result - 200

//CALCULATE DISCOUNT
discount(500, 0.45); // Result - 225

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