Skip to main content

Typescript

Double question mark ??​

It's the nullish coalescing operator.

const value = value1 ?? value2;

If value1 is null or undefined, use value2. Otherwise use value1.

Double exclamation mark !!​

!! ensure the resulting type is a boolean. It's a double negation

Filter a list of values on removing duplicated values​

of(string[].concat(string[])) will not work

of(string[], string[]).pipe(
  distinct()
).subscribe(list => {
    this.isMulti = list.length >= 2;
})

Remove accents in a string in JS​

str.normalize("NFD").replace(/[\u0300-\u036f]/g, "")