javascript - Default arguments for qml function gives syntax errors

This code works fine in browser hosted JavaScript environment :

    function foo(a=true)
    {
        console.log(a)
    }

But doing the same in qml is giving syntax error.

What might I be doing wrong ?

This code works fine in browser hosted JavaScript environment :

    function foo(a=true)
    {
        console.log(a)
    }

But doing the same in qml is giving syntax error.

What might I be doing wrong ?

Share Improve this question asked May 23, 2017 at 7:15 Amit Tomar 4,8587 gold badges53 silver badges86 bronze badges

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2 Answers 2

Sorted by: Reset to default 11

In QML, you should write the function as

function foo(a) {
    if (a === undefined) a = true

    console.log(a)
}

The syntax

function foo(a=true)

is not supported as this syntax was introduced in ECMA-262 6th edition while QML only implements the fifth edition (as of Qt 5.11).

From Qt 5.12, this code will work fine. See release note.

Hope this will help people in the future.