export const isnan = ( v ) => Number . isNaN ( v ) ; export const isValidNumber = ( v ) => typeof v === 'number' && ! Number . isNaN ( v ) ; export const TEST_MIN_IF_NOT_NAN = ( value , limit ) : boolean => ! isnan ( limit ) && ( ( limit < 0 && value <= limit ) || ( limit >= 0 && value >= limit ) ) ; export const VEC_LEN_SQ = ( { x = 0 , y = 0 } = { } ) => x * x + y * y ; export const TEST_MAX_IF_NOT_NAN = ( value , max ) => ! isnan ( max ) && ( ( max < 0 && value < max ) || ( max >= 0 && value > max ) ) ; export function fireAfterInterval ( method , interval ? ) { if ( ! interval ) { method ( ) ; return null ; } return setTimeout ( ( ) => method ( ) , interval ) ; }