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Kent C. Dodds
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The expressive power of expressions in default values for parameters

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NOTE: This is a cross-post from my newsletter . I publish each email two weeks after it鈥檚 sent. Subscribe to get more content like this earlier right in your inbox! 馃拰

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.

Consider the following code:

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) and some annoying boilerplate. Luckily for us, ES6 introduced new syntax into JavaScript that we can use to simplify things a bit. In particular: . Let's checkout what the above would be like when using this feature.

Notice that we鈥檙e able to take each expression and put it on the right side of the equals sign. If the parameter is undefined then the expression on the right side will be evaluated. This allows us to only call the requiredParam function if kind or size is undefined . It also is possible to use the value of other parameters in our expression like we do in the default param for upperKind which I find to be a ridiculously cool feature and I use this all the time in options configuration for some of my tools ( for example ).

I鈥檒l add that the same kinds of semantics would apply for object destructuring (whether as a parameter or not) as well. For example, if we change the arguments to be an options object:

Or, if we want to destructure the options object directly in the parameter list:

Fun stuff!

Conclusion

I hope you find this helpful! If you鈥檇 like to watch me talk about this a bit, you can check out this section of my ES6 workshop I gave and recorded at PayPal a while back: ES6 and Beyond Workshop Part 1 at PayPal (Jan 2017) . Good luck!

Looking for a job? Looking for a developer? Check out my job board:

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Learn more about JavaScript from me :

Learn more about JavaScript from me

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I demo some advanced features of destructuring!

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Immigration 07/01/2018, 11:34am

The Families Belong Together march starting in Daley Plaza, Saturday, June 30th, 2018. | James Foster/For the Sun-Times

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Thousands of demonstrators braved the sweltering heat to make their way downtown Saturday to protest the Trump administration鈥檚 immigration policies.

Despite the triple-digit heat index , scores of sweat-drenched protesters filled Daley Plaza by 11 a.m. for the 鈥淔amilies Belong Together鈥 march. Chicago police estimated the crowd at more than 50,000.

Attendees spoke out against the recently rescinded policy of separating migrant family members at the U.S. border with Mexico, and others went a step further and called for the abolition of U.S. Immigration and Customs Enforcement, or ICE.

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Sen. Dick Durbin called the rally 鈥渁 place I had to be.鈥 He also called for 鈥渓opping off heads鈥 at ICE and said November will give Democrats and others urging for policy changes a microphone to do so.

鈥淚t鈥檚 cruel and incompetent,鈥 Durbin said. 鈥淚nstead of deporting gangs they鈥檙e going after, and deporting, families. The debate [on immigration policy] isn鈥檛 over. It鈥檚 just starting.鈥

The march was the culmination of a month of unrest brought on by a Trump administration policy that separated children from their parents and sent them to facilities around the country.

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The Families Belong Together march makes its way south on Clark St. | James Foster/For the Sun-Times
The Families Belong Together march makes its way south on Clark St. | James Foster/For the Sun-Times
The Families Belong Together march makes its way south on Clark St. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march makes its way south on Clark St. | James Foster/For the Sun-Times
Pat Deep at the Families Belong Together march. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march starting in Daley Plaza, Saturday, June 30th, 2018. | James Foster/For the Sun-Times
The Families Belong Together march starting in Daley Plaza, Saturday, June 30th, 2018. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
Ivette Sancen at the Families Belong Together march. | James Foster/For the Sun-Times
The Families Belong Together march started in Daley Plaza. | James Foster/For the Sun-Times
Melody Angel speaks at the Families Belong Together march. | James Foster/For the Sun-Times
The Families Belong Together march starting in Daley Plaza. | James Foster/For the Sun-Times
Victor Tapia, age 7, at the Families Belong Together march. | James Foster/For the Sun-Times
Victor Tapia, age 7, at the Families Belong Together march. | James Foster/For the Sun-Times
The Families Belong Together march makes its way south on Clark St. | James Foster/For the Sun-Times

Though the policy was walked back, many at the Saturday march said the policy should never be repeated. Around noon, protesters, toting signs that said 鈥淔ire ICE鈥 and 鈥#EndFamilyDetention鈥 among other slogans, took their message to ICE鈥檚 regional field office, making their way South on Clark Street to the intersection of Clark and West Congress Parkway.

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