无法读取函数中未定义的属性“0”（p5.js）

Question

At the first line of my code I put var array = [] but I get the error pointing towards this function. If I log array before calling the function its exactly what it's supposed to be but if I do that anywhere inside the function it doesn't get logged before the error

 let elements = 25 var array = [] let goal = [] let tempAr = [] let i = 1 function setup() { // put setup code here createCanvas(600, 600) background(25) // make the goal array ascending while (goal.length < elements) { goal.push(i) i++ } // make the scrambled array i = 0 tempAr = goal while (i < elements) { let rng = Math.floor(random(tempAr.length)) array.push(tempAr[rng]) tempAr.splice(rng, 1) i++ } } function draw() { fill('#f1f442') drawRect() sort() } function drawRect() { i = 1 while (i <= elements) { rect(i * (width / elements) - (width / elements), height - array[i - 1] * height / elements, width / elements, array[i - 1] * height / elements) i++ } } function sort() { let sorted = false while (!sorted) { sorted = true var e = 0 while (e < array.length) { if (array[e] > array[e + 1]) { let temp = array[e + 1] array[e + 1] = array[e] array[e] = temp sorted = false } drawRect() e++ } } }

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Answer 1

sort() is the name of a built-in function in p5.js .
You've to choose a different name for your function. So rename sort to something else (eg mysort ) to make your code run.

 let elements = 25 var array = [] let goal = [] let tempAr = [] let i = 1 function setup() { // put setup code here createCanvas(600, 600) background(25) // make the goal array ascending while (goal.length < elements) { goal.push(i) i++ } // make the scrambled array i = 0 tempAr = goal while (i < elements) { let rng = Math.floor(random(tempAr.length)) array.push(tempAr[rng]) tempAr.splice(rng, 1) i++ } } function draw() { fill('#f1f442') drawRect() mysort() } function drawRect() { i = 1 while (i <= elements) { rect(i * (width / elements) - (width / elements), height - array[i - 1] * height / elements, width / elements, array[i - 1] * height / elements) i++ } } function mysort() { let sorted = false while (!sorted) { sorted = true var e = 0 while (e < array.length) { if (array[e] > array[e + 1]) { let temp = array[e + 1] array[e + 1] = array[e] array[e] = temp sorted = false } drawRect() e++ } } }

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