Typescript: Uncaught typeError, Cannot read property “push” of undefined
private readonly lives: number = 5;
public loadLifeImages() {
var ammount: Array<any>;
for (var i = 0; i < this.lives; i++) {
ammount.push(i);
}
ammount.forEach((v, i) => {
console.log(this.lives);
console.log(i);
var newLifeImage = new Image();
newLifeImage.src = './assets/images/SpaceShooterRedux/PNG/UI/PlayerLife1_blue.png';
newLifeImage.onload = () => {
this.ctx.drawImage(newLifeImage, i * 50, 50, 30, 30);
}
})
}
I'm trying to push these numbers to this array in Typescript, so I can use a for each loop to put the images on my canvas, however it gives the error 'cannot read property "push" of undefined' I know it's a bit double, but I really can't figure out any other way to do it. Can someone figure out what it is? thanks in advance!
arrays typescript undefined push
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
add a comment |
private readonly lives: number = 5;
public loadLifeImages() {
var ammount: Array<any>;
for (var i = 0; i < this.lives; i++) {
ammount.push(i);
}
ammount.forEach((v, i) => {
console.log(this.lives);
console.log(i);
var newLifeImage = new Image();
newLifeImage.src = './assets/images/SpaceShooterRedux/PNG/UI/PlayerLife1_blue.png';
newLifeImage.onload = () => {
this.ctx.drawImage(newLifeImage, i * 50, 50, 30, 30);
}
})
}
I'm trying to push these numbers to this array in Typescript, so I can use a for each loop to put the images on my canvas, however it gives the error 'cannot read property "push" of undefined' I know it's a bit double, but I really can't figure out any other way to do it. Can someone figure out what it is? thanks in advance!
arrays typescript undefined push
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
add a comment |
private readonly lives: number = 5;
public loadLifeImages() {
var ammount: Array<any>;
for (var i = 0; i < this.lives; i++) {
ammount.push(i);
}
ammount.forEach((v, i) => {
console.log(this.lives);
console.log(i);
var newLifeImage = new Image();
newLifeImage.src = './assets/images/SpaceShooterRedux/PNG/UI/PlayerLife1_blue.png';
newLifeImage.onload = () => {
this.ctx.drawImage(newLifeImage, i * 50, 50, 30, 30);
}
})
}
I'm trying to push these numbers to this array in Typescript, so I can use a for each loop to put the images on my canvas, however it gives the error 'cannot read property "push" of undefined' I know it's a bit double, but I really can't figure out any other way to do it. Can someone figure out what it is? thanks in advance!
arrays typescript undefined push
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
private readonly lives: number = 5;
public loadLifeImages() {
var ammount: Array<any>;
for (var i = 0; i < this.lives; i++) {
ammount.push(i);
}
ammount.forEach((v, i) => {
console.log(this.lives);
console.log(i);
var newLifeImage = new Image();
newLifeImage.src = './assets/images/SpaceShooterRedux/PNG/UI/PlayerLife1_blue.png';
newLifeImage.onload = () => {
this.ctx.drawImage(newLifeImage, i * 50, 50, 30, 30);
}
})
}
I'm trying to push these numbers to this array in Typescript, so I can use a for each loop to put the images on my canvas, however it gives the error 'cannot read property "push" of undefined' I know it's a bit double, but I really can't figure out any other way to do it. Can someone figure out what it is? thanks in advance!
arrays typescript undefined push
arrays typescript undefined push
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
asked Nov 13 '18 at 14:04
J PeeneJ Peene
112
112
add a comment |
add a comment |
1 Answer
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This can be fixed by initializing ammount like this:
var ammount: Array<any> = ;
This is because just typing var ammount: Array<any> doesn't give a value to ammount, so it becomes undefined (the default value for all javascript variables). = initializes the variable to be an empty array.
However, I want to point out that judging from the code you have here, there is no good reason to create a new array and just push the values into it. Instead, you could just put the forEach logic inside the for-loop.
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This can be fixed by initializing ammount like this:
var ammount: Array<any> = ;
This is because just typing var ammount: Array<any> doesn't give a value to ammount, so it becomes undefined (the default value for all javascript variables). = initializes the variable to be an empty array.
However, I want to point out that judging from the code you have here, there is no good reason to create a new array and just push the values into it. Instead, you could just put the forEach logic inside the for-loop.
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
add a comment |
This can be fixed by initializing ammount like this:
var ammount: Array<any> = ;
This is because just typing var ammount: Array<any> doesn't give a value to ammount, so it becomes undefined (the default value for all javascript variables). = initializes the variable to be an empty array.
However, I want to point out that judging from the code you have here, there is no good reason to create a new array and just push the values into it. Instead, you could just put the forEach logic inside the for-loop.
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
add a comment |
This can be fixed by initializing ammount like this:
var ammount: Array<any> = ;
This is because just typing var ammount: Array<any> doesn't give a value to ammount, so it becomes undefined (the default value for all javascript variables). = initializes the variable to be an empty array.
However, I want to point out that judging from the code you have here, there is no good reason to create a new array and just push the values into it. Instead, you could just put the forEach logic inside the for-loop.
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
This can be fixed by initializing ammount like this:
var ammount: Array<any> = ;
This is because just typing var ammount: Array<any> doesn't give a value to ammount, so it becomes undefined (the default value for all javascript variables). = initializes the variable to be an empty array.
However, I want to point out that judging from the code you have here, there is no good reason to create a new array and just push the values into it. Instead, you could just put the forEach logic inside the for-loop.
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
edited Nov 13 '18 at 14:21
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
answered Nov 13 '18 at 14:14
ShamPooShamShamPooSham
510416
510416
add a comment |
add a comment |
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