Function interpolationV

packages/core/src/render3/instructions/interpolation.ts:28–51

(lView: LView, values: any[])

 * Returns the concatenated string when any of the arguments changes, `NO_CHANGE` otherwise.
 */
export function interpolationV(lView: LView, values: any[]): string | NO_CHANGE {
  ngDevMode && assertLessThan(2, values.length, 'should have at least 3 values');
  let isBindingUpdated = false;
  let bindingIndex = getBindingIndex();

  for (let i = 1; i < values.length; i += 2) {
    // Check if bindings (odd indexes) have changed
    isBindingUpdated = bindingUpdated(lView, bindingIndex++, values[i]) || isBindingUpdated;
  }
  setBindingIndex(bindingIndex);

  if (!isBindingUpdated) {
    return NO_CHANGE;
  }

  // Build the updated content
  let content = values[0];
  for (let i = 1; i < values.length; i += 2) {
    // The condition is to prevent an out-of-bound read
    content += renderStringify(values[i]) + (i + 1 !== values.length ? values[i + 1] : '');
  }

  return content;
}

/**
 * Creates an interpolation binding with 1 expression.