[SOLVED] JavaScript function default parameters

Issue

const add = (a = 1, b = 1, c = 1) => a + b + c
add(4, , 2)

Throws Uncaught SyntaxError, unexpected token ‘,’

How do I call the function so b defaults to the value 1

Solution

Pass undefined as value

Check this: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters#passing_undefined_vs._other_falsy_values

const add = (a = 1, b = 1, c = 1) => a + b + c
console.log(add(4, undefined, 2))

Answered By – Sanket Shah

Answer Checked By – Gilberto Lyons (BugsFixing Admin)

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