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To declare an empty array for a type variable, set the array's type to Type[] , e.g. const arr: Animal[] = [] . Any elements you add to the array need to conform to the specific type, otherwise you would get an error. Copied!
In C#, you can use strings as an array of characters, However, more common practice is to use the string keyword to declare a string variable. The string keyword is an alias for the System. String class. To declare an empty string.
An array in TypeScript can contain elements of different data types using a generic array type syntax, as shown below. let values: (string | number)[] = ['Apple', 2, 'Orange', 3, 4, 'Banana']; // or let values: Array<string | number> = ['Apple', 2, 'Orange', 3, 4, 'Banana'];
To declare an empty array in Java, we can use the new keyword. After the declaration of an empty array, we can initialize it using different ways. The syntax of declaring an empty array is as follows. data-type[] array-name = new data-type[size]; //or data-type array-name[] = new data-type[size];
The definition of string array should be:
// instead of this
// var errors: [string];
// we need this
var errors: string[];
errors = [];
Note: another issue could be the parameter key here
...forEach(function (key) {...
I would guess that we often should declare two of them, because first is very often value, second key/index
Object.keys(response.data.modelState)
.forEach(function (value, key) {
errors.push.apply(errors, response.data.modelState[key]);
});
And even, we should use arrow function, to get the parent as this
Object.keys(response.data.modelState)
.forEach( (value, key) => {
errors.push.apply(errors, response.data.modelState[key]);
});
Outside of a method:
arr: string[] = [];
Missing an obvious answer, needed when not assigning it to a variable: [] as string[]
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