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How to Use the Rest Operator in JavaScript

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OHIOLee answered on January 14, 2020 Popularity 10/10 Helpfulness 2/10

answer How to Use the Rest Operator in JavaScript

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How to Use the Rest Operator in JavaScript

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// A perfect example to illustrate this would be if we have a list of numbers,
// and we want to use the first number as the multiplier.
// We then want to put the multiplied value of the remaining numbers in an array:

const multiplyArgs = (multiplier, ...otherArgs) => {
    return otherArgs.map((number) => {
    return number * multiplier;
    });
};

let multipiedArray = multiplyArgs(6, 5, 7, 9);

console.log(multipiedArray); // [30,42,54]


// Here is a good representation of the rest operator and what its value looks like:

const multiplyArgs = (multiplier, ...otherArgs) => {
    console.log(multiplier); // 6
    console.log(otherArgs); // [5,7,9]
};

multiplyArgs(6, 5, 7, 9);


// Note: The Rest parameter must be the last formal parameter.

const multiplyArgs = (multiplier, ...otherArgs, lastNumber) => {
    console.log(lastNumber); // Uncaught SyntaxError: Rest parameter must be last formal parameter
};

multiplyArgs(6, 5, 7, 9);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript rest

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Contributed on Aug 22 2022

OHIOLee

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the rest operator javascript

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function sum(...numbers) {
	return numbers.reduce((accumulator, current) => {
		return accumulator += current;
	});
};
 
sum(1,2) // 3
sum(1,2,3,4,5) // 15

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: oprea.rocks

Tags: javascript j

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Contributed on Jan 14 2020

Brainy Butterfly

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how to assign an rest operator in javascript

Comment

function multiply(multiplier, ...theArgs) {
  return theArgs.map(element => {
    return multiplier * element
  })
}

let arr = multiply(2, 1, 2, 3)
console.log(arr)  // [2, 4, 6]

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: assign as

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Contributed on Sep 30 2020

Breakable Boar

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How to Use the Rest Operator in JavaScript

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const func = (first, ...rest) => {};

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Aug 22 2022

OHIOLee

0 Answers Avg Quality 2/10

Rest Operator in javascript

Comment

function restOp(firstNum, ...args) {
    let result = [];
    for (let i in args) {
        const multi = firstNum * args[i];
        result.push(multi)
    }
    return result;
}
console.log(restOp(3, 2, 3, 5));
//Output:[ 6, 9, 15 ]

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 04 2022

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

How to Use the Rest Operator in JavaScript

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