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Rest Parameters – The Rest parameters do not restrict the number of values that we can pass to a function and the passed values must be the same type otherwise throw the error. Stayed Informed – Learn Angular 2 with TypeScript For Example as, //Rest Parameters let addNumbers = function (...nums: number []) { let p; let sum: number = 0 ; for (p = 0 ; p < nums.length; p ++ ) { sum = sum + nums[p]; } return sum; } //The Result addNumbers( 1 , 2 ); addNumbers( 1 , 2 , 3 ); addNumbers( 1 , 12 , 10 , 18 , 17 ); I hope you are enjoying with this post! Please share with you friends. Thank you!!