materialuiupgraded/packages/material-ui/src/InputBase/utils.js

Material-UI's workspace package

// Supports determination of isControlled().
// Controlled input accepts its current value as a prop.
//
// @see https://facebook.github.io/react/docs/forms.html#controlled-components
// @param value
// @returns {boolean} true if string (including '') or number (including zero)
export function hasValue(value) {
  return value != null && !(Array.isArray(value) && value.length === 0);
}

// Determine if field is empty or filled.
// Response determines if label is presented above field or as placeholder.
//
// @param obj
// @param SSR
// @returns {boolean} False when not present or empty string.
//                    True when any number or string with length.
export function isFilled(obj, SSR = false) {
  return (
    obj &&
    ((hasValue(obj.value) && obj.value !== '') ||
      (SSR && hasValue(obj.defaultValue) && obj.defaultValue !== ''))
  );
}

// Determine if an Input is adorned on start.
// It's corresponding to the left with LTR.
//
// @param obj
// @returns {boolean} False when no adornments.
//                    True when adorned at the start.
export function isAdornedStart(obj) {
  return obj.startAdornment;
}