Error: Cannot read property 'push' of undefined in [null].
class A implements OnInit {
stringArr: string[];
ngOnInit() {
for(let i=0; i<4; i++) {
this.stringArr.push("aaa");
}
}
}
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3 Answers
The array needs to be initialized:
stringArr = [];
1 Comment
Khateeb321
I should print this and post on my desk.
For me the syntax was a little more than the accepted answer because I was using a full array type.
stringArr: Array<string> = [];
Also, this would work too
stringArr: string[] = [];
Just 2 ways to type a new array
1 Comment
nibbana
"string" is the TypeScript string type, rather than "String".
class A implements OnInit {
stringArr: string=[];
ngOnInit() {
for(let i=0; i<4; i++) {
this.stringArr.push("aaa");
}
}
}
Here stringArr is defined as string, but not as an array of string. Define stringArr as blank array [].
1 Comment
vektor
Welcome to Stack Overflow! Please fix the formatting of your code block.