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cosmos.ts
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cosmos.ts
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export {}
declare global {
interface Array<T> {
first(): T | undefined;
last(): T | undefined;
isEmpty(): boolean;
}
interface String {
isEmpty(): boolean;
splitOnce(separator: string): [string, string] | undefined
toTitle(): string;
}
}
// eslint-disable-next-line
Array.prototype.first = function<T> (this: T[]): T | undefined {
return this[0]
}
// eslint-disable-next-line
Array.prototype.last = function<T> (this: T[]): T | undefined {
return this.at(-1)
}
// eslint-disable-next-line
Array.prototype.isEmpty = function<T> (this: T[]): boolean {
return this.length === 0
}
// eslint-disable-next-line
String.prototype.isEmpty = function (this: String): boolean {
return this.length === 0
}
// eslint-disable-next-line
String.prototype.splitOnce = function (this: string, separator: string): [string, string] | undefined {
const index = this.indexOf(separator)
if (index === -1) {
return undefined
}
const first = this.substring(0, index)
const second = this.substring(index + separator.length)
return [first, second]
}
// eslint-disable-next-line
String.prototype.toTitle = function (this: string): string {
if (this.length < 1) {
return this
}
if (this.length === 1) {
return this.toUpperCase()
}
return this[0].toUpperCase() + this.substring(1)
}