javascript - How do I prevent both my if statements running the first time? -


quick question i'm drawing blank, if have event listener contains 2 if statements on first time round both true don't want both of them execute how prevent this? can break on first conditional or that?

js

var input = document.queryselector('.js-input'),     output = document.queryselector('.js-output');  input.addeventlistener('keydown', function (event) {     if (this.value.length === 0) {         console.log('run once');     }      if (this.value === '') {         console.log('this empty show hint')     } }); 

var input = document.queryselector('.js-input'),     output = document.queryselector('.js-output'); var firsttimecallbackrun= true;  input.addeventlistener('keydown', function (event) {     if (this.value.length === 0) {         console.log('run once');         if(firsttimecallbackrun) {           firsttimecallbackrun = false;           return;         }     }      if (this.value === '') {         console.log('this empty show hint')     } });

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