CODEWITHSUNDEEP
javascript
rew
rew

Reputation: 375

Javascript ternary using evaluated as result

If I combine these 2 statements:

x = 1+1;
y = (x<1)? x : 0;

to be one statement:

z = (1+1<1) ? 1+1 : 0;

Is the evaluation cached such that there would not be a performance hit?

Asked a different way, is there a way, using one variable, to use the value calculated if it meets a condition, or if not, set a value?

Upvotes: 0

Views: 41

Answers (1)

Bergi
Bergi

Reputation: 664579

Is the evaluation cached such that there would not be a performance hit?

No, you've duplicated the code, so it will be evaluated twice. JS does not do any common subexpression elimination in general.

Is there a way, using one variable, to use the value calculated if it meets a condition, or if not, set a value?

No, except for using a function (that internally can refer to its parameter multiple times). Assuming you meant <= 0 when you wrote < 1, you could e.g. do

var y = Math.max(1+1, 0);

Upvotes: 1

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