how to set the default argument for a function js code example

Example 1: javascript parameter default parameter

function say(message='Hi') {
    console.log(message);
}
say(); // 'Hi'
say(undefined); // 'Hi'
say('Hello'); // 'Hello'


function date(d = today()) {
    console.log(d);
}
function today() {
    return (new Date()).toLocaleDateString("en-US");
}
date();


function add(x = 1, y = x, z = x + y) {
    return x + y + z;
}
console.log(add()); // 4

Example 2: ES6: Set Default Parameters for Your Functions

const resultDisplayArray = []; 
for(let i = 0; i < result.failure.length; i++) {
resultDisplayArray.push(`<li class="text-warning">${result.failure[i]}</li>`); 
}

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Javascript Example

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