JavaScript ゲーム製作勉強会 Vol.2で話した内容になります

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43. var dist = 30;
var id;
function run(){
this.x += (dist - this.x) / 3;
if(dist - this.x < 0.01){
clearInterval(id);
}
}
id = setInterval(run, 100);

47. var startTime = Date.now(); //
var startX = this.x; //
var distX = 30; //
var duration = 1500; //
var id;
function run(){
var currentTime = Date.now(); //
var progress = (currentTime - startTime) / duration; //
this.x = (distX - startX) * progress + startX; //
if(this.x >= distX){ //
clearInterval(id);
}
}
id = setInterval(run, 10);