SOURCE

function Single(fn){
    var ret;
    return function(){
        return ret || (fn.apply(this,arguments))
    }
}

var getInput = Single((params)=>{
    return `this is ${params}`
})

var string123 = getInput('123')
var string1234 = getInput('234')
console.log(string123  === string1234)
console.log(string1234)