CODEWITHSUNDEEP
javascriptoperator-keywordoperator-precedence
Hui
Hui

Reputation: 1

Operator precedence in JavaScript

I am reading operator precedence on this page. It shows "===" has higher precedence than "||" operator. If it is true, then "a === doesThisHappen()" will run first. But why I did not get console.log('This happens!')?

var a;

a = 1;

function doesThisHappen() {

    console.log('This happens!');

    return 0;
}

if (a || a === doesThisHappen()) {
    console.log('Something is there.');
}

Upvotes: 0

Views: 84

Answers (1)

Joni
Joni

Reputation: 111219

Order of evaluation and operator precedence are orthogonal concepts. In a || b the left side a is evaluated first no matter what the right side b contains. More over, if the left side evaluates to true the right side is not evaluated.

Upvotes: 3

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